I actually deleted my facebook a few months ago because I felt it was worsening my already laughable social life. When people looked at my interests and the types of topics I read it became apparent to them that I was boring and weird so they just "un-friended" me. Oh well, live and learn I guess.
My advice?: Just stay away from facebook, it's a rather stupid past-time. Your experience may vary, but It hasn't really done any good for me.