{"id":2204,"date":"2021-10-01T04:21:00","date_gmt":"2021-10-01T04:21:00","guid":{"rendered":"https:\/\/public-exchange.org\/usc\/?post_type=project&#038;p=2204"},"modified":"2025-10-22T06:10:21","modified_gmt":"2025-10-22T06:10:21","slug":"thorn","status":"publish","type":"project","link":"https:\/\/public-exchange.org\/usc\/project\/thorn\/","title":{"rendered":"Blocking abusive content online"},"content":{"rendered":"\n<div class=\"wp-block-group alignfull is-style-default p-project-hero has-base-black-background-color has-background is-layout-flow wp-container-core-group-is-layout-b45d237d wp-block-group-is-layout-flow\" style=\"padding-top:0;padding-bottom:var(--wp--preset--spacing--30)\">\n<div class=\"wp-block-group alignfull p-project-hero__background has-global-padding is-layout-constrained wp-block-group-is-layout-constrained has-background\" style=\"min-height:782px;background-image:url(&#039;https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/Blocking-Abusive-Content-Online_Hero_.jpg&#039;);background-position:50% 50%;background-size:cover;\">\n<div class=\"wp-block-group aligngrid p-project-hero__content is-style-white is-layout-flow wp-container-core-group-is-layout-b709b9a7 wp-block-group-is-layout-flow is-style-white--1\" style=\"border-radius:24px;padding-top:var(--wp--preset--spacing--40);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--40);padding-left:var(--wp--preset--spacing--40)\">\n<div class=\"wp-block-group aligngrid is-layout-flow wp-container-core-group-is-layout-19eabfb7 wp-block-group-is-layout-flow\"><p><span class=\"c-tag-list\">\n\t\t\t\t\t<span class=\"c-tag-list__item t-category c-tag-list__item--orange\">\n\t\t\t<a href=\"https:\/\/public-exchange.org\/usc\/projects\/?_practice_area=health-wellbeing\" class=\"c-tag-list__item-link\">Health &amp; Well-being<\/a>\n\t\t<\/span>\n\t\t<\/span>\n<\/p>\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column tribe-has-stacking-order is-layout-flow wp-block-column-is-layout-flow\" style=\"--tribe-stacking-order:0\"><h1 class=\"wp-block-heading is-style-large is-style-large--2\">Blocking abusive content online<\/h1><\/div>\n\n\n\n<div class=\"wp-block-column tribe-has-stacking-order is-layout-flow wp-block-column-is-layout-flow\" style=\"--tribe-stacking-order:0\"><p>Uncovering how Content Delivery Networks (CDNs) can unintentionally serve child sexual abuse material (CSAM)\u2014and how using this knowledge can help stop its spread.<\/p>\n\n<p class=\"is-style-default t-category\" style=\"margin-top:var(--wp--preset--spacing--40);text-transform:uppercase\"><span class=\"c-university-list\">\n\t\t\t<span class=\"c-university-list__item t-category\">USC<\/span>\n\t\t\t\t<span class=\"c-university-list__item t-category\">Completed 2022<\/span>\n\t<\/span>\n<\/p><\/div>\n<\/div>\n<\/div>\n\n\n\n<div id=\"section-navigation\" class=\"wp-block-group aligngrid is-style-accent p-section-navigation is-layout-flow wp-block-group-is-layout-flow is-style-accent--3\" style=\"border-radius:50px;padding-top:var(--wp--preset--spacing--10);padding-right:var(--wp--preset--spacing--10);padding-bottom:var(--wp--preset--spacing--10);padding-left:var(--wp--preset--spacing--10)\">\n<div class=\"wp-block-group p-section-navigation__mobile-wrapper is-content-justification-space-between is-layout-flex wp-container-core-group-is-layout-cecd7293 wp-block-group-is-layout-flex\" style=\"margin-top:0\"><nav class=\"p-section-navigation__navigation wp-block-navigation is-layout-flex wp-container-core-navigation-is-layout-fbcf6490 wp-block-navigation-is-layout-flex\" aria-label=\"Thorn Menu\"><ul class=\"wp-block-navigation__container  p-section-navigation__navigation wp-block-navigation\"><li class=\" wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/public-exchange.org\/usc\/project\/thorn\/\"><span class=\"wp-block-navigation-item__label\">Overview<\/span><\/a><\/li><li class=\" wp-block-navigation-item wp-block-navigation-link\"><a class=\"wp-block-navigation-item__content\"  href=\"https:\/\/public-exchange.org\/usc\/project\/thorn\/partnership\/\"><span class=\"wp-block-navigation-item__label\">Partnership<\/span><\/a><\/li><\/ul><\/nav>\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/public-exchange.org\/usc\/project\/thorn\/cdn-report\/\">Report<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group aligngrid is-content-justification-right is-nowrap is-layout-flex wp-container-core-group-is-layout-82baacbd wp-block-group-is-layout-flex\">\n<p class=\"is-style-small has-base-white-color has-text-color has-link-color wp-elements-a7b37de32eda91e8d85350c2c70c535e is-style-small--4\">Share this page<\/p>\n\n\n\n<ul class=\"wp-block-outermost-social-sharing has-normal-icon-size has-icon-color is-style-logos-only is-layout-flex wp-container-outermost-social-sharing-is-layout-15e81e10 wp-block-social-sharing-is-layout-flex\"><li style=\"color: #fff000; \" class=\"outermost-social-sharing-link outermost-social-sharing-link-linkedin has-yellow-color wp-block-outermost-social-sharing-link\">\n\t<a href=\"https:\/\/www.linkedin.com\/shareArticle?mini=true&#038;url=https%3A%2F%2Fpublic-exchange.org%2Fusc%2Fproject%2Fthorn%2F&#038;title=Blocking%20abusive%20content%20online\" aria-label=\"Share on LinkedIn\" rel=\"noopener nofollow\" target=\"_blank\" class=\"wp-block-outermost-social-sharing-link-anchor\">\n\t\t<svg width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M19.7,3H4.3C3.582,3,3,3.582,3,4.3v15.4C3,20.418,3.582,21,4.3,21h15.4c0.718,0,1.3-0.582,1.3-1.3V4.3 C21,3.582,20.418,3,19.7,3z M8.339,18.338H5.667v-8.59h2.672V18.338z M7.004,8.574c-0.857,0-1.549-0.694-1.549-1.548 c0-0.855,0.691-1.548,1.549-1.548c0.854,0,1.547,0.694,1.547,1.548C8.551,7.881,7.858,8.574,7.004,8.574z M18.339,18.338h-2.669 v-4.177c0-0.996-0.017-2.278-1.387-2.278c-1.389,0-1.601,1.086-1.601,2.206v4.249h-2.667v-8.59h2.559v1.174h0.037 c0.356-0.675,1.227-1.387,2.526-1.387c2.703,0,3.203,1.779,3.203,4.092V18.338z\"><\/path><\/svg>\t\t<span class=\"wp-block-outermost-social-sharing-link-label screen-reader-text\">\n\t\t\tShare on LinkedIn\t\t<\/span>\n\t<\/a>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--70);padding-bottom:var(--wp--preset--spacing--70)\">\n<div class=\"wp-block-columns aligngrid is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column has-global-padding is-layout-constrained wp-block-column-is-layout-constrained\">\n<figure class=\"wp-block-image size-full has-custom-border l-sticky alignfull\" style=\"margin-top:0;margin-bottom:0\"><img loading=\"lazy\" decoding=\"async\" width=\"1667\" height=\"1250\" src=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/Blocking-Abusive-Content-Online_Content-Delivery-Network-1.png\" alt=\"\" class=\"wp-image-3624\" style=\"border-radius:24px\" srcset=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/Blocking-Abusive-Content-Online_Content-Delivery-Network-1.png 1667w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/Blocking-Abusive-Content-Online_Content-Delivery-Network-1-300x225.png 300w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/Blocking-Abusive-Content-Online_Content-Delivery-Network-1-1024x768.png 1024w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/Blocking-Abusive-Content-Online_Content-Delivery-Network-1-768x576.png 768w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/Blocking-Abusive-Content-Online_Content-Delivery-Network-1-1536x1152.png 1536w\" sizes=\"auto, (max-width: 1667px) 100vw, 1667px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-f1189ed3 wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/live-uscpx.pantheonsite.io\/wp-content\/uploads\/2025\/07\/mark.svg\" alt=\"\" class=\"wp-image-8\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading is-style-medium is-style-medium--5\">Impact<\/h2>\n<\/div>\n\n\n\n<p>We provided a clear, technical breakdown of how CDNs process content\u2014and where there are gaps in the system\u2014equipping Thorn with critical insights to quickly act with takedown requests for CSAM. Our findings help Thorn team up with CDN providers and law enforcement more effectively to stop the spread of harmful content, making the internet safer for all.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" style=\"margin-top:var(--wp--preset--spacing--50);margin-bottom:0\"\/>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-109dd7a5 wp-block-group-is-layout-flex\" style=\"margin-top:var(--wp--preset--spacing--50)\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/live-uscpx.pantheonsite.io\/wp-content\/uploads\/2025\/07\/mark.svg\" alt=\"\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading is-style-medium is-style-medium--6\">Challenge<\/h2>\n<\/div>\n\n\n\n<p>CDNs power today\u2019s internet\u2014speeding up websites, protecting them from attacks, and making the web seamless worldwide. But those same systems also mask website sources, making it harder to detect and remove CSAM. With reports of CSAM online rising 15,000% since 2010, Thorn wanted to understand how CDNs work so they could use that information to help curb the abuse.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-e1fea541 wp-block-columns-is-layout-flex\" style=\"margin-top:var(--wp--preset--spacing--50)\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><article class=\"b-stat-card b-stat-card--theme-light-gray wp-block-tribe-stat-card\">\n\t<div class=\"b-stat-card__inner\">\n\t\t<h3 class=\"b-stat-card__content\">\n\t\t\t<span class=\"b-stat-card__number\">\n\t\t\t\t<span class=\"b-stat-card__number-value t-display-xx-large\">15,000%<\/span>\n\t\t\t\t<span class=\"b-stat-card__number-suffix t-display-x-small\"><\/span>\n\t\t\t<\/span>\n\t\t\t\t\t\t\t<span class=\"b-stat-card__label t-body-large\">increase in online CSAM since 2010<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t<\/div>\n\t<\/article>\n<\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" style=\"margin-top:var(--wp--preset--spacing--50);margin-bottom:0\"\/>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-109dd7a5 wp-block-group-is-layout-flex\" style=\"margin-top:var(--wp--preset--spacing--50)\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/live-uscpx.pantheonsite.io\/wp-content\/uploads\/2025\/07\/mark.svg\" alt=\"\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading is-style-medium is-style-medium--7\">Our Plan<\/h2>\n<\/div>\n\n\n\n<p>We worked with a networking expert from the USC Information Sciences Institute to analyze how CDNs work. By mapping out how they accept, store, and redistribute content, we helped Thorn find out who&#8217;s sharing CSAM to stop it in its tracks.<\/p>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity aligngrid\" style=\"margin-top:0;margin-bottom:0\"\/>\n\n\n\n<section class=\"wp-block-group alignfull has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--70);padding-bottom:var(--wp--preset--spacing--70)\">\n<div class=\"wp-block-group aligngrid has-global-padding is-content-justification-left is-layout-constrained wp-container-core-group-is-layout-12dd3699 wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group alignwide is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading is-style-large has-balanced-text is-style-large--8\" style=\"margin-top:0\">Project Goals<\/h2>\n<\/div>\n\n\n\n<div class=\"wp-block-columns aligngrid is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-stretch has-light-gray-background-color has-background  is-animated-on-scroll-25 tribe-animation-type-fade-in tribe-animation-direction-bottom is-layout-flow wp-block-column-is-layout-flow\" style=\"border-radius:16px;padding-top:var(--wp--preset--spacing--40);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--40);padding-left:var(--wp--preset--spacing--40);--tribe-animation-speed:0.9s;--tribe-animation-offset:90px;--tribe-animation-delay:0s;--tribe-animation-easing:cubic-bezier(0.390, 0.575, 0.565, 1.000)\">\n<h3 class=\"wp-block-heading is-style-small has-balanced-text is-style-small--9\">Understand CDN mechanics<\/h3>\n\n\n\n<p>We mapped how CDNs serve and redistribute online content, including CSAM.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-stretch has-light-gray-background-color has-background  is-animated-on-scroll-25 tribe-animation-type-fade-in tribe-animation-direction-bottom tribe-animation-mobile-disable-delay is-layout-flow wp-block-column-is-layout-flow\" style=\"border-radius:16px;padding-top:var(--wp--preset--spacing--40);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--40);padding-left:var(--wp--preset--spacing--40);--tribe-animation-speed:0.9s;--tribe-animation-offset:90px;--tribe-animation-delay:0.3s;--tribe-animation-easing:cubic-bezier(0.390, 0.575, 0.565, 1.000)\">\n<h3 class=\"wp-block-heading is-style-small has-balanced-text is-style-small--10\">Spot weak links<\/h3>\n\n\n\n<p>We analyzed how information flows across the web to uncover where\u2014and how\u2014we can keep abusive content from breaking through.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-stretch has-light-gray-background-color has-background  is-animated-on-scroll-25 tribe-animation-type-fade-in tribe-animation-direction-bottom tribe-animation-mobile-disable-delay is-layout-flow wp-block-column-is-layout-flow\" style=\"border-radius:16px;padding-top:var(--wp--preset--spacing--40);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--40);padding-left:var(--wp--preset--spacing--40);--tribe-animation-speed:0.9s;--tribe-animation-offset:90px;--tribe-animation-delay:0.6s;--tribe-animation-easing:cubic-bezier(0.390, 0.575, 0.565, 1.000)\">\n<h3 class=\"wp-block-heading is-style-small has-balanced-text is-style-small--11\">Foster more effective collaboration<\/h3>\n\n\n\n<p>We recommended strategies to help advocates and law enforcement work with CDN operators to remove CSAM faster.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n\n\n\n<section class=\"wp-block-group alignfull has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\" style=\"padding-top:0;padding-bottom:var(--wp--preset--spacing--70)\">\n<div class=\"wp-block-group aligngrid has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-columns are-vertically-aligned-top aligngrid is-layout-flex wp-container-core-columns-is-layout-f0342b05 wp-block-columns-is-layout-flex\" style=\"margin-top:0;margin-bottom:0\">\n<div class=\"wp-block-column is-vertically-aligned-top tribe-has-stacking-order is-layout-flow wp-block-column-is-layout-flow\" style=\"padding-top:0;flex-basis:50%;--tribe-stacking-order:0\">\n<h2 class=\"wp-block-heading is-style-medium has-balanced-text is-style-medium--12\" style=\"margin-top:0\">Approach<\/h2>\n\n\n\n<p class=\"is-style-default\" style=\"margin-top:var(--wp--preset--spacing--20);margin-bottom:var(--wp--preset--spacing--30)\">We combed through technical analyses and literature to uncover why harmful material is hard to remove and gave Thorn the data needed to address it.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-top tribe-has-stacking-order is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%;--tribe-stacking-order:0\">\n<div class=\"wp-block-columns tribe-has-custom-gap aligngrid is-layout-flex wp-container-core-columns-is-layout-0b7e7e7d wp-block-columns-is-layout-flex\" style=\"margin-top:0;margin-bottom:0;padding-right:0;padding-bottom:0;padding-left:0\">\n<div class=\"wp-block-column tribe-has-stacking-order  is-animated-on-scroll-25 tribe-animation-type-fade-in tribe-animation-direction-bottom is-layout-flow wp-block-column-is-layout-flow\" style=\"--tribe-stacking-order:0;--tribe-animation-speed:0.6s;--tribe-animation-offset:50px;--tribe-animation-delay:0s;--tribe-animation-easing:cubic-bezier(0.390, 0.575, 0.565, 1.000)\">\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-fc054d2d wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-large is-resized l-shink-none\"><img loading=\"lazy\" decoding=\"async\" width=\"115\" height=\"115\" src=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/09\/Quantitative-Analysis-1.svg\" alt=\"\" class=\"wp-image-706\" style=\"aspect-ratio:1;object-fit:cover;width:96px\"\/><\/figure>\n\n\n\n<p class=\"is-style-lead-in is-style-lead-in--13\">Data Analysis<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-fc054d2d wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-image size-large is-resized l-shink-none\"><img loading=\"lazy\" decoding=\"async\" width=\"114\" height=\"114\" src=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/09\/literature.svg\" alt=\"\" class=\"wp-image-701\" style=\"aspect-ratio:1;object-fit:cover;width:96px\"\/><\/figure>\n\n\n\n<p class=\"is-style-lead-in is-style-lead-in--14\">Literature Review<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n\n\n\n<section class=\"wp-block-group alignfull is-style-light-gray has-global-padding is-layout-constrained wp-block-group-is-layout-constrained is-style-light-gray--15\" style=\"padding-top:var(--wp--preset--spacing--70);padding-bottom:var(--wp--preset--spacing--70)\">\n<div class=\"wp-block-columns aligngrid  is-animated-on-scroll-25 tribe-animation-type-fade-in tribe-animation-direction-bottom is-layout-flex wp-container-core-columns-is-layout-ec2e7a44 wp-block-columns-is-layout-flex\" style=\"border-top-style:none;border-top-width:0px;border-bottom-style:none;border-bottom-width:0px;padding-top:0;padding-bottom:0;--tribe-animation-speed:0.6s;--tribe-animation-offset:50px;--tribe-animation-delay:0s;--tribe-animation-easing:cubic-bezier(0.390, 0.575, 0.565, 1.000)\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:75%\">\n<div class=\"wp-block-group is-style-default aligngrid is-layout-flow wp-block-group-is-layout-flow\" style=\"margin-top:0;margin-bottom:0;padding-bottom:0\">\n<h3 class=\"wp-block-heading has-text-align-left has-balanced-text is-style-small is-style-small--16\" style=\"margin-top:0;margin-bottom:var(--wp--preset--spacing--30);padding-top:0;padding-bottom:0\">\u201cContent Delivery Networks make the high-speed internet experience possible. But they also make it harder to combat the flow of child sexual abuse materials on the internet. USC helped us explore the ways these networks work to inform holistic strategies to stop the spread of online child sexual abuse material.\u201d<\/h3>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\">\n<div class=\"wp-block-group is-layout-flex wp-container-core-group-is-layout-0ce16b2c wp-block-group-is-layout-flex\" style=\"margin-top:0;margin-bottom:0;padding-top:0;padding-bottom:0\">\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-text-align-left is-style-default\" style=\"margin-top:0;margin-bottom:0\"><strong><strong>Melissa Stoebel<\/strong><\/strong><\/p>\n\n\n\n<p class=\"has-text-align-left is-style-default\" style=\"margin-top:0;margin-bottom:0\">VP of Business Development &amp; Strategic Insights, Thorn<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n\n\n\n<div class=\"wp-block-group alignfull has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--70);padding-bottom:var(--wp--preset--spacing--70)\">\n<div class=\"wp-block-group aligngrid is-layout-flow wp-container-core-group-is-layout-d7e64215 wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading is-style-overline is-style-overline--17\">Recent Updates<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div>\n\n\n<div class=\"b-related-news b-related-news--layout-grid aligngrid aligngrid wp-block-acf-related-news\">\n\t\t\t\t\t<article class=\"c-news-card\">\n\t<ul class=\"c-tag-list c-news-card__tags\">\n\t\t\t\t\t<li class=\"c-tag-list__item t-category c-tag-list__item--orange\">\n\t\t\t<a href=\"https:\/\/public-exchange.org\/usc\/news\/?_practice_area=health-wellbeing\" class=\"c-tag-list__item-link\">Health &amp; Well-being<\/a>\n\t\t<\/li>\n\t\t<\/ul>\n\t<div class=\"c-news-card__inner\">\n\t\t\t\t\t<div class=\"c-news-card__image\">\n\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/12\/px-food-insecurity-top-1920x1080-2-1024x576.avif\" class=\"attachment-large size-large\" alt=\"\" srcset=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/12\/px-food-insecurity-top-1920x1080-2-1024x576.avif 1024w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/12\/px-food-insecurity-top-1920x1080-2-300x169.avif 300w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/12\/px-food-insecurity-top-1920x1080-2-768x432.avif 768w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/12\/px-food-insecurity-top-1920x1080-2-1536x864.avif 1536w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/12\/px-food-insecurity-top-1920x1080-2-680x383.avif 680w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/12\/px-food-insecurity-top-1920x1080-2-1280x720.avif 1280w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/12\/px-food-insecurity-top-1920x1080-2.avif 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/>\t\t\t<\/div>\n\t\t\t\t<div class=\"c-news-card__content\">\n\t\t\t<h3 class=\"c-news-card__title t-display-x-small\">Food insecurity remains high in L.A. County, but who it affects is changing<\/h3>\n\t\t\t\t\t\t\t<p class=\"c-news-card__metadata\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"c-news-card__metadata-outlet t-category\">USC Dornsife News <\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"c-news-card__metadata-separator t-category\">|<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"c-news-card__metadata-post-date t-category\">December 2025<\/span>\n\t\t\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t<\/div>\n\t\t<a href=\"https:\/\/public-exchange.org\/usc\/news\/food-insecurity-remains-high-lacounty\/\" class=\"c-news-card__link-overlay\">Read more about Food insecurity remains high in L.A. County, but who it affects is changing<\/a>\n\t<\/div>\n<\/article>\n\t\t\t\t\t<article class=\"c-news-card\">\n\t<ul class=\"c-tag-list c-news-card__tags\">\n\t\t\t\t\t<li class=\"c-tag-list__item t-category c-tag-list__item--orange\">\n\t\t\t<a href=\"https:\/\/public-exchange.org\/usc\/news\/?_practice_area=health-wellbeing\" class=\"c-tag-list__item-link\">Health &amp; Well-being<\/a>\n\t\t<\/li>\n\t\t<\/ul>\n\t<div class=\"c-news-card__inner\">\n\t\t\t\t\t<div class=\"c-news-card__image\">\n\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/11\/snap-story-1024x683.webp\" class=\"attachment-large size-large\" alt=\"\" srcset=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/11\/snap-story-1024x683.webp 1024w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/11\/snap-story-300x200.webp 300w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/11\/snap-story-768x512.webp 768w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/11\/snap-story.webp 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/>\t\t\t<\/div>\n\t\t\t\t<div class=\"c-news-card__content\">\n\t\t\t<h3 class=\"c-news-card__title t-display-x-small\">The federal SNAP-funding mess has made L.A.\u2019s food-insecurity crisis clearer than ever<\/h3>\n\t\t\t\t\t\t\t<p class=\"c-news-card__metadata\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"c-news-card__metadata-outlet t-category\">LA Times<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"c-news-card__metadata-separator t-category\">|<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"c-news-card__metadata-post-date t-category\">November 2025<\/span>\n\t\t\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t<\/div>\n\t\t<a href=\"https:\/\/public-exchange.org\/usc\/news\/the-federal-snap-funding-mess-has-made-l-a-s-food-insecurity-crisis-clearer-than-ever\/\" class=\"c-news-card__link-overlay\">Read more about The federal SNAP-funding mess has made L.A.\u2019s food-insecurity crisis clearer than ever<\/a>\n\t<\/div>\n<\/article>\n\t\t\t\t\t<article class=\"c-news-card\">\n\t<ul class=\"c-tag-list c-news-card__tags\">\n\t\t\t\t\t<li class=\"c-tag-list__item t-category c-tag-list__item--orange\">\n\t\t\t<a href=\"https:\/\/public-exchange.org\/usc\/news\/?_practice_area=health-wellbeing\" class=\"c-tag-list__item-link\">Health &amp; Well-being<\/a>\n\t\t<\/li>\n\t\t<\/ul>\n\t<div class=\"c-news-card__inner\">\n\t\t\t\t\t<div class=\"c-news-card__image\">\n\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/77667691007-usp-news-eaton-fire-scorches-altadena-neighboorho-1-1024x683.webp\" class=\"attachment-large size-large\" alt=\"\" srcset=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/77667691007-usp-news-eaton-fire-scorches-altadena-neighboorho-1-1024x683.webp 1024w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/77667691007-usp-news-eaton-fire-scorches-altadena-neighboorho-1-300x200.webp 300w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/77667691007-usp-news-eaton-fire-scorches-altadena-neighboorho-1-768x512.webp 768w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/77667691007-usp-news-eaton-fire-scorches-altadena-neighboorho-1.webp 1320w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/>\t\t\t<\/div>\n\t\t\t\t<div class=\"c-news-card__content\">\n\t\t\t<h3 class=\"c-news-card__title t-display-x-small\">Homeowners trying to rebuild after Altadena&#8217;s Eaton Fire face concerns over lead levels in soil<\/h3>\n\t\t\t\t\t\t\t<p class=\"c-news-card__metadata\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"c-news-card__metadata-outlet t-category\">CBS News<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"c-news-card__metadata-separator t-category\">|<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"c-news-card__metadata-post-date t-category\">October 2025<\/span>\n\t\t\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t<\/div>\n\t\t<a href=\"https:\/\/public-exchange.org\/usc\/news\/homeowners-trying-to-rebuild-after-altadenas-eaton-fire-face-concerns-over-lead-levels-in-soil\/\" class=\"c-news-card__link-overlay\">Read more about Homeowners trying to rebuild after Altadena&#8217;s Eaton Fire face concerns over lead levels in soil<\/a>\n\t<\/div>\n<\/article>\n\t\t\t\t\t<article class=\"c-news-card\">\n\t<ul class=\"c-tag-list c-news-card__tags\">\n\t\t\t\t\t<li class=\"c-tag-list__item t-category c-tag-list__item--orange\">\n\t\t\t<a href=\"https:\/\/public-exchange.org\/usc\/news\/?_practice_area=health-wellbeing\" class=\"c-tag-list__item-link\">Health &amp; Well-being<\/a>\n\t\t<\/li>\n\t\t<\/ul>\n\t<div class=\"c-news-card__inner\">\n\t\t\t\t\t<div class=\"c-news-card__image\">\n\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"363\" src=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/09\/CopyofDSC06800-e1760591194536.webp\" class=\"attachment-large size-large\" alt=\"\" srcset=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/09\/CopyofDSC06800-e1760591194536.webp 500w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/09\/CopyofDSC06800-e1760591194536-300x218.webp 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/>\t\t\t<\/div>\n\t\t\t\t<div class=\"c-news-card__content\">\n\t\t\t<h3 class=\"c-news-card__title t-display-x-small\">Community Comes Together for Access to Free Lead Soil Testing<\/h3>\n\t\t\t\t\t\t\t<p class=\"c-news-card__metadata\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"c-news-card__metadata-outlet t-category\">Department of Angels<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"c-news-card__metadata-separator t-category\">|<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"c-news-card__metadata-post-date t-category\">September 2025<\/span>\n\t\t\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t<\/div>\n\t\t<a href=\"https:\/\/public-exchange.org\/usc\/news\/community-comes-together-for-access-to-free-lead-soil-testing\/\" class=\"c-news-card__link-overlay\">Read more about Community Comes Together for Access to Free Lead Soil Testing<\/a>\n\t<\/div>\n<\/article>\n\t<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull is-style-light-gray has-global-padding is-layout-constrained wp-block-group-is-layout-constrained is-style-light-gray--18\" style=\"padding-top:var(--wp--preset--spacing--70);padding-bottom:var(--wp--preset--spacing--70)\">\n<div class=\"wp-block-group aligngrid is-layout-flow wp-container-core-group-is-layout-d7e64215 wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group is-content-justification-space-between is-layout-flex wp-container-core-group-is-layout-9366075c wp-block-group-is-layout-flex\">\n<h2 class=\"wp-block-heading is-style-overline is-style-overline--19\">Related Projects<\/h2>\n\n\n<div class=\"b-explore-projects-button is-style-outline tribe-button-has-icon\">\n\t<a href=\"https:\/\/public-exchange.org\/usc\/project-catalog\/\" class=\"wp-block-button__link wp-element-button\">Explore all projects<\/a>\n<\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div>\n\n\n<div class=\"b-related-projects aligngrid aligngrid wp-block-acf-related-projects\">\n\t\t\t\t\t<article class=\"c-project-card\">\n\t<ul class=\"c-tag-list c-project-card__tags\">\n\t\t\t\t\t<li class=\"c-tag-list__item t-category c-tag-list__item--brown\">\n\t\t\t<a href=\"https:\/\/public-exchange.org\/usc\/projects\/?_practice_area=disaster-response\" class=\"c-tag-list__item-link\">Disaster Response<\/a>\n\t\t<\/li>\n\t\t<\/ul>\n\t<div class=\"c-project-card__inner\">\n\t\t\t\t\t<div class=\"c-project-card__image\">\n\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"536\" src=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2026\/01\/PX_Projects_Featured-Images_CLEAN-Waters_01-1024x536.png\" class=\"attachment-large size-large\" alt=\"\" srcset=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2026\/01\/PX_Projects_Featured-Images_CLEAN-Waters_01-1024x536.png 1024w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2026\/01\/PX_Projects_Featured-Images_CLEAN-Waters_01-300x157.png 300w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2026\/01\/PX_Projects_Featured-Images_CLEAN-Waters_01-768x402.png 768w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2026\/01\/PX_Projects_Featured-Images_CLEAN-Waters_01.png 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/>\t\t\t<\/div>\n\t\t\t\t<div class=\"c-project-card__content\">\n\t\t\t\t\t\t\t<ul class=\"c-university-list c-project-card__universities\">\n\t\t\t<li class=\"c-university-list__item t-category\">USC<\/li>\n\t\t<\/ul>\n\t\t\t\t\t\t<h3 class=\"c-project-card__title t-display-small\">Testing L.A.\u2019s oceans and rivers after the 2025 wildfires<\/h3>\n\t\t\t\t\t\t\t<p class=\"c-project-card__excerpt t-body\">Measuring water quality post-wildfires to understand potential health and environmental risks.<\/p>\n\t\t\t\t\t<\/div>\n\t\t<a href=\"https:\/\/public-exchange.org\/usc\/project\/clean_waters\/\" class=\"c-project-card__link-overlay\">Read more about Testing L.A.\u2019s oceans and rivers after the 2025 wildfires<\/a>\n\t<\/div>\n<\/article>\n\t\t\t\t\t<article class=\"c-project-card\">\n\t<ul class=\"c-tag-list c-project-card__tags\">\n\t\t\t\t\t<li class=\"c-tag-list__item t-category c-tag-list__item--green\">\n\t\t\t<a href=\"https:\/\/public-exchange.org\/usc\/projects\/?_practice_area=climate-sustainability\" class=\"c-tag-list__item-link\">Climate &amp; Sustainability<\/a>\n\t\t<\/li>\n\t\t<\/ul>\n\t<div class=\"c-project-card__inner\">\n\t\t\t\t\t<div class=\"c-project-card__image\">\n\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"536\" src=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/PX_Projects_Featured-Images_USC-Urban-Trees-1024x536.jpg\" class=\"attachment-large size-large\" alt=\"\" srcset=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/PX_Projects_Featured-Images_USC-Urban-Trees-1024x536.jpg 1024w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/PX_Projects_Featured-Images_USC-Urban-Trees-300x157.jpg 300w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/PX_Projects_Featured-Images_USC-Urban-Trees-768x402.jpg 768w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/PX_Projects_Featured-Images_USC-Urban-Trees.jpg 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/>\t\t\t<\/div>\n\t\t\t\t<div class=\"c-project-card__content\">\n\t\t\t\t\t\t\t<ul class=\"c-university-list c-project-card__universities\">\n\t\t\t<li class=\"c-university-list__item t-category\">USC<\/li>\n\t\t<\/ul>\n\t\t\t\t\t\t<h3 class=\"c-project-card__title t-display-small\">Greening L.A.\u2019s hottest streets<\/h3>\n\t\t\t\t\t\t\t<p class=\"c-project-card__excerpt t-body\">Bringing more trees, shade, and fresh air to L.A. by identifying where, what kind, and how many trees to plant for the biggest impact.<\/p>\n\t\t\t\t\t<\/div>\n\t\t<a href=\"https:\/\/public-exchange.org\/usc\/project\/usc-urban-trees-initiative\/\" class=\"c-project-card__link-overlay\">Read more about Greening L.A.\u2019s hottest streets<\/a>\n\t<\/div>\n<\/article>\n\t\t\t\t\t<article class=\"c-project-card\">\n\t<ul class=\"c-tag-list c-project-card__tags\">\n\t\t\t\t\t<li class=\"c-tag-list__item t-category c-tag-list__item--green\">\n\t\t\t<a href=\"https:\/\/public-exchange.org\/usc\/projects\/?_practice_area=climate-sustainability\" class=\"c-tag-list__item-link\">Climate &amp; Sustainability<\/a>\n\t\t<\/li>\n\t\t<\/ul>\n\t<div class=\"c-project-card__inner\">\n\t\t\t\t\t<div class=\"c-project-card__image\">\n\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"536\" src=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/PX_Projects_Featured-Images_Tracking-Climate-Stories-1024x536.jpg\" class=\"attachment-large size-large\" alt=\"\" srcset=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/PX_Projects_Featured-Images_Tracking-Climate-Stories-1024x536.jpg 1024w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/PX_Projects_Featured-Images_Tracking-Climate-Stories-300x157.jpg 300w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/PX_Projects_Featured-Images_Tracking-Climate-Stories-768x402.jpg 768w, https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/PX_Projects_Featured-Images_Tracking-Climate-Stories.jpg 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/>\t\t\t<\/div>\n\t\t\t\t<div class=\"c-project-card__content\">\n\t\t\t\t\t\t\t<ul class=\"c-university-list c-project-card__universities\">\n\t\t\t<li class=\"c-university-list__item t-category\">USC<\/li>\n\t\t<\/ul>\n\t\t\t\t\t\t<h3 class=\"c-project-card__title t-display-small\">Tracking climate stories on screen<\/h3>\n\t\t\t\t\t\t\t<p class=\"c-project-card__excerpt t-body\">Tracking how climate stories impact the TV and film industry\u2014and how they shape audience perceptions of climate change.<\/p>\n\t\t\t\t\t<\/div>\n\t\t<a href=\"https:\/\/public-exchange.org\/usc\/project\/climate-storytelling\/\" class=\"c-project-card__link-overlay\">Read more about Tracking climate stories on screen<\/a>\n\t<\/div>\n<\/article>\n\t<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Uncovering how Content Delivery Networks (CDNs) can unintentionally serve child sexual abuse material (CSAM)\u2014and how using this knowledge can help stop its spread.<\/p>\n","protected":false},"author":14,"featured_media":2327,"parent":0,"menu_order":0,"template":"","practice":[7],"university":[4],"class_list":["post-2204","project","type-project","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Blocking abusive content online - USC<\/title>\n<meta name=\"description\" content=\"USC partners with Thorn to block online abusive content and strengthen tools to detect and remove child sexual abuse material on digital platforms.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/public-exchange.org\/usc\/project\/thorn\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Blocking abusive content online - USC\" \/>\n<meta property=\"og:description\" content=\"USC partners with Thorn to block online abusive content and strengthen tools to detect and remove child sexual abuse material on digital platforms.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/public-exchange.org\/usc\/project\/thorn\/\" \/>\n<meta property=\"og:site_name\" content=\"USC\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-22T06:10:21+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/public-exchange.org\/usc\/wp-content\/uploads\/sites\/2\/2025\/10\/PX_Projects_Featured-Images_Blocking-Abusive-Content-Online.jpg\" \/>\n\t<meta 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