I use Facebook for 2 things: Keeping up with classmates since I only see them once a week, and talking to my dad when he goes out of town. I have 24 friends and don't forsee that number going up very much more.
But Facebook is an interconnected web of no-lifers. The average amount of friends girls in my class have is 500. Each of those 500 people has 500 friends, and all 500 of those have another 500. It's absolutely pathetic.
In fact, the other day my Steam friend told me about a girl at his school he liked, and linked to her Facebook. I decided to do a little sneaking. Not knowing her at all, I sent her a friend request. She accepted it.
I told him to find someone else.