I joined MySpace in September 2003. At that time no one was on there at all. I felt like a loser while all the cool kids were at some other school. So I mass e-mailed between 30 000 and 50 000 people and told them to come over. Everybody joined overnight.
Educators are still spending way too much time trying to control what kids learn bending the content to their own purposes hoping beyond hope to change - by using technology - but not change too much.