myspace is dangerous but i personally find Facebook is worse. On Myspace you can't talk to anyone you don't know. But on Facebook you get all sorts of randoms adding you. Like 4o year old men who start talking to you....

I don't really use bebo, but Piczo and Freewebs are okay.
You realise you can adjust privacy settings though right? So that people can see very little without being a friend and that you can block anyone who sends you a friend request if you're uncomfortable that they added you in the first place.