I used to be on FB... I finally deleted my account entirely. I did sign up under a pseudonym, but really don't expect to use it at all.
It's a thin layer of anonymity I have here, but I'm keeping it.
Also, I've come to a personal conclusion that putting all of one's life "out there", whether on FB or Twitter, or Myspace, or wherever... makes for a shallow life. It's spread too thinly - like butter over too much bread - and there is no depth. "Friends" aren't actually one's friends, just a whole bunch of people we are barely acquainted with, who are privy to too many/too intimate of details of one's life.
I'm pulling my photos offline, too, except for some personal favorite "artsy" photos. Having my whole life out there no longer appeals to me.
I don't consider FC to be that "out there"... silly, yes, as everyone in the whole world can read these postings, however, as is true in a couple of other forums I'm a part of, it does seem that this venue is more meaningful than FB could ever be for me.