Online hacking group Anonymous declared 'total war' on IS after the attacks in Paris. But who are they, and will their controversial tactics help in the fight against extremism?
Online hacking collective Anonymous declared "total war" on IS after the attacks in Paris. Their tactics have often been controversial, sometimes illegal, and don't always win them support. As so-called Islamic State vows to fight back, what is Anonymous likely to achieve and will its strategy help or hinder the fight against extremism?
Presenter: Becky Milligan
Producer: Ben Crighton.