Playing cat and mouse with online jihadis

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In response to jihadists using social media for recruitment, propaganda and threat, the counter-terrorism unit at London’s Metropolitan Police have launched a programme to combat them and protect the British public. But how effective is it? And is it possible to control the jihadists online in the first place? BBC Security Correspondent Gordon Corera gained rare access to the front-line workers at the Met, who are fighting the jihadists online. (Image: Smoke rises behind an Islamic State flag. Credit: Reuters)