just watched a BBC radio 1 “documentary”… thought it was interesting.
it was a BBC radio sort of interview where they talked too some of the people on youtube that have millions of subscribers based in the uk (since BBC is in the uk)
you can listen too it here: http://www.bbc.co.uk/programmes/b04f83nq
people involved: KSI, yogscast members, ALI-A and there maybe more