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In September 2011, warnings about hackers invading the accounts of Facebook users to post pornographic movies on their walls without their knowledge began circulating in e-mail and on social networking sites. These messages usually contained cautions meant for friends of those users to avoid opening (clicking links to) those movies and to avoid voting on any proffered picture sent via the same channel: We've yet to encounter any verified account of hackers having surreptitiously inserted invisible risqué films into the Facebook accounts of innocent users, posts which those users cannot see but are visible to their friends. Sometimes images that appears to be links to pornographic videos show up in compromised Facebook accounts, but those posts are clearly visible to the account owners. Those who are using social networking sites prudently therefore should not fear they're about to unknowingly begin issuing porn video come-ons to their friends and family. It's also the case posts with sexual content made by other Facebook users who have friended or tagged you may show up in your timeline, in which case you need to report the posts to Facebook and unfriend or block the perpetrators. But this phenomenon is part of the way Facebook ordinarily works, not the result of hackers gaming the system. In an incident completely separate and unrelated to the two-months-earlier warnings cited above, in mid-November 2011 Facebook users began to report a rash of pornographic pictures (and other disturbing images) showing up across the social networking site. This occurrence was triggered by spam messages that tricked users into falling for a self-XSS scheme that had them copy and paste JavaScript into their browsers' address bars, thereby exploiting a browser bug which hijacked Facebook accounts, posted the disturbing images on news feeds, and spread the images to others.
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