Tens of thousands of Twitter accounts that support ISIS (now called the Islamic State) went down thanks to a rogue hacker organization called the Ghost Security Group. "I do think the majority of the reporting is being done by groups like Anonymous and Ghost Security. But there are other initiatives, including the Counter Extremism Project and the Sawab Center, which are contributing to reporting efforts," J.M. Berger, an expert on the Islamic State at Brookings Institution, said.