CEP Executive Director David Ibsen writes: "Mark Zuckerberg’s appearance before the European Parliament last week was, by all accounts, a disaster. The agreed-upon format allowed the CEO of one of the richest and largest tech companies in the world to group the questions from MEPs and answer those he wanted, while ignoring others or promising to “get back to you on that.” Never missing a chance to repeat the folksy anecdote that Facebook started in his college dorm room, Mr. Zuckerberg described his company’s content monitoring evolution from a user-led flagging system to its present use of sophisticated Artificial Intelligence software that, he proclaimed, “can flag 99 percent of the ISIS and al-Qaeda related content that we end up taking down before any person in our community flags that for us.” Research by the Counter Extremism Project (CEP) tells a different and more sobering story. CEP has turned up dozens of posts and grisly propaganda videos that have been online for extended periods. This month, CEP located a violent ISIS propaganda video that had been online for two years, along with other videos that had been online for days but had managed to rack up thousands of views and dozens of shares. Two of these videos featured mass executions."