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The Islamic State, known as ISIS or ISIL, has exploited social media, most notoriously Twitter, to send its propaganda and messaging out to the world and to draw in people vulnerable to radicalisation.

“Social Apocalypse: The role of communications technology in mediating apocalyptic communities”, originally published by Brookings Institution on 28 May 2015

Last week Twitter General Counsel, Vijaya Gadde, contributed an editorial in The Washington Post entitled ‘Here’s How We’re Trying to Stop Abuse while Preserving Free Speech.’ Yesterday, Twitter’s Director of Product Management, Shreyas Doshi, released new information on ‘Policy and Product Updates Aimed at Combating Abuse’ in a Twitter Blog post, including an update on their Violence and Threats: Abusive Behaviour Policy.

It is relatively easy to identify tens of thousands of social media users who have an interest in violent ideologies, but very difficult to figure out which users are worth watching. For students of extremist movements and those working to counter violent extremism online, deciphering the signal amid the noise can prove incredibly daunting. This paper sets out a first step in solving that problem. The authors have devised a scoring system to find out which social media accounts within a specific extremist circle were most influential and most prone to be influenced (a tendency we called exposure).