On Tuesday, militants from Islamic State (Isis) released a propaganda video depicting the beheading of...James Wright Foley, an American photojournalist...The video...was initially uploaded to YouTube [part of Google] and has been widely circulated over social media; spreading across Twitter, Facebook, Instagram and other platforms...Twitter has...begun to remove all tweets embedding Isis’s video or screenshots taken from it. In a seemingly unprecedented step, Twitter CEO Dick Costolo tweeted..."We have been and are actively suspending accounts as we discover them related to this graphic imagery..." ...YouTube, which removed the video swiftly after its initial upload,...[said] it doesn’t allow members of foreign terrorist organisations to have YouTube accounts, or people affiliated with terrorist organisations...Isis has an extremely efficient social media operation. The Guardian...[has] previously reported on their adept use of Justpaste.it and other hosting platforms.