Participation
I have found that participation in something is always the hardest thing to get people to do online. You make it tantalizing and yet only one or two will grab the 'hook'. It seems that most online users like to go by trends rather than personal interests, in other words... If everyone is doing it then I'll do it too regardless as to if it is what I want to do. Some online users have almost given up their minds to a trend, sadly if that trend is leading them to something negative then they are doomed.