Erin Marie Saltman, Co-author of a Quilliam's report on online extremism

Recent videos showing a masked jihadist - speaking in English with a distinctive London accent - killing two US journalists have shocked the West. Erin Marie Saltman is a senior researcher with Quilliam, a self-described counter-extremist think-tank based in London. She is the co-author of a report, "Jihad Trending: A comprehensive analysis of online extremism and how to counter it", in which she analyses the use of videos and social media by the Islamic State organisation in Iraq and Syria.