Who is winning in the virtual battle with jihadists?

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Much of the Islamic State's expansion has been happening online as well as on the ground. Both the US State Department and the UK's Metropolitan Counter-Terrorism Unit have engaged in the online battle against the jihadists. So who is winning? BBC Security Correspondent Gordon Corera talks to Professor Gabriel Weimann of Haifa University who has been studying jihadists' presence online for 16 years. (Image:A flag of the Islamic State is seen on the other side of a bridge in Rashad. Credit: AFP/Getty Images)