I use Bebo, but I have a MySpace account too. I tend not to do anything with my MySpace account, but I keep my Bebo "fairly" active.
I've never tried Facebook, and I really don't care to either.
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It's a cop nest, so it seems. Also, it has been used by other authority figures, such as colleges in the U.S. to spy on their students' activities.
I'll stick with Bebo. It's less of a pain than MySpace and is much better organized. Top that off with MySpace server crashes and password hacks. I once got a list of 300+ accounts and their passwords from a friend who had found it online somewhere. I didn't make use of it, of course. I felt sorry for users who were exposed by the cracker who managed to get the passwords out into the public domain. I simply don't trust MySpace.
Seifer.