Adam Deen and Prem Mahadevan know what they're talking about when it comes to jihadi terror networks. One used to be an Islamist extremist, and the other advises governments on the inner workings of groups like ISIS. Here's what they think works – and doesn't – to stop terror recruitment.

Integration: no magic bullet

Late last year, the head of Switzerland's Federal Office of Police argued that young people at risk of joining terror groups "must be accompanied, watched and socially integrated" to stop the threat.

But "integration is not the answer", says Deen, who has since left the Al-Muhajiroun terror group of which he was a part until 2003. He now works for the UK-based Quilliam Foundation, which bills itself as "the world's first counter-extremism organisation".

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