Thing is with MySpace (never overly used it, thought it was horrible) can't you make friends with bands and celebs, etc? In the way with Facebook you either join a group or "become a fan of" bollocks
But this is actual people. Weird. I imagine this is what "facebook was better when it US colleges only etc" people fume over
I don't know about MySpace, but yes, you can become friends with celebrities on Facebook. Peter Paige, who played Emmett on Queer As Folk, friended me a few months ago. I've never met him, though I spoke with his agent a couple of years ago when I was trying to put together a QAF convention. (I have met two of the cast in person and spoken to a few others on the phone, though, and the people from the production office recognized my name when I went to the prop/set/costume sale after the show wrapped. So I thought that maybe he recognized my name until I saw that he had something like 1200 "friends"... he obviously uses it to keep his name out in the public eye, though most of his posts these days seem to be about American Idol.)
I do have a few dozen authors on my Facebook friendslist, but in almost every case, they're authors whom I actually know from working on conventions. The exceptions are some of the authors who post here, and Samuel R. Delany (though I did meet him at another convention some time ago, and mentioned it when I sent the friend request).
Some celebrities who are on Facebook seem to keep their friendslists restricted to people they actually know, though. I sent Ellen Muth (from Dead Like Me) a request a couple of months ago, but she never responded. And she actually knows who I am. I think I may have mentioned this before, but I chaired one con and worked on another where she was a guest, and attended a third. Last time I saw her, when I was at the airport to pick her up, she came up to me and said, "Hi, remember me?" before I could even say hello. Later that weekend she came up to me and said, "I saw you on TV this morning!" It seems that she'd been watching the in-house channel in the hotel, on which we'd been showing some old convention footage on a loop, including a series of Youtube videos I'd been in to promote the con. (My reaction was to think, "Shouldn't I be saying these things to you?"

)
I also sent a friend request to David Gerrold around the same time that I sent one to Ellen, and he hasn't responded either. I'm a little surprised at that one, since last time I saw him at a con, he yelled out my name and waved at me from about 50 feet away, so it's not like I'm some fanboy stranger sending him a friend request. It's no big deal, though. I was just a bit surprised. He may also be keeping his friendlist restricted to people he's close to.