Videos and pictures posted online by terrorists are supposed to be tools of propaganda. But they can also play a crucial role in helping to identify the locations of these militants. The producers of the Web site Bellingcat have dedicated themselves to doing exactly that and recently were able to locate an Iraqi training camp of Islamic State militants. "This stuff really isn't that hard to do once you pick up the basics," Bellingcat-founder Eliot Higgins told WorldViews.