conversation around. we keep saying what is it about the people who join isis what's wrong with them are they poor or disenfranchised. what is it about what isis is doing that's effective in recruiting people that are seemingly so normal? >> how does this grab somebody out of an upper middle class home in london? >> again, there's not one answer. but that brutality that we find so difficult to understand, it is almost like a counterculture. it is almost like if you feel sort of alienated, the most outrageous thing that you can do in this country and in european countries is to go there and to do that. >> we were talking earlier about sort of the social media tools that isis used to recruit its followers. how ubiquitous are they on social media and what kind of tools are counterterrorism efforts bringing to the fight? >> the interesting thing is of course isis is on the internet. but what makes isis so powerful what gives it such an umf on