How can social communities prevent cyber-bullying?

So this week was in the the newspapers the story the girl who committed suicide because she was pushed to do this by a grown up woman who asked her to do this via Myspace. The girl committed suicide and this story make us think twice about the social communities : how far can we go? What shall we do in order to allow these social communities to connect people instead of separating them? Please give me your opinion on this issue.

Here’s a fragment of this story (Reuteurs)

Woman cleared of felonies in MySpace suicide case

(…)

Drew and others created the fake MySpace persona of a 16-year-old boy to woo Meier for several weeks, then abruptly ended the relationship and said the world would be better off without her. Meier hanged herself in October 2006, just hours after she had read those final messages.

(…)