The IRU has been up and running since July 2015 as part of the European Counter Terrorism Centre (ECTC) in the Hague. The unit is charged with monitoring the Internet for extremist propaganda and referring “relevant online content towards concerned Internet service providers” in particular social media. Much was made of how the IRU could “contact social network service provider Facebook directly to ask it to delete a Web page run by ISIS or request details of other pages that might be run by the same user.”

Although companies are not required to take down the content, European Commission figures from April 2016 show that the IRU had an effective removal rate of 91 percent. At that time it had assessed more than 4,700 posts across 45 platforms and sent over 3,200 referrals for Internet companies to remove content. The totals now are closer to 8,000 and 7,000, and Europol told Ars it will publish full details in the coming days.