Are social media sites the ‘command and control’ networks for terrorists?

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In November, the new director of GCHQ launched a blistering attack on technology firms for allowing themselves to be what he called “the command and control centres” for terrorist groups. So are the companies doing enough? And is it their responsibility anyway? BBC Security Correspondent Gordon Corera talks to Victoria Grand, director of Public Policy for Google, which owns YouTube (Image: Militants with the Islamic State group are seen after placing their group's flag on a hilltop at the eastern side of the town of Kobane. Credit: Associated Press)