Oddly, one of the most enjoyable parts of FB for me is seeing who comes up in my list of possible friends. Because I am friends with the kids of a friend in AZ, I keep seeing the names of some of my oldest son's friends from when he was in kindergarten and first grade, before we moved. Today I saw the names of two women who were in my play group, 25 years ago. One had moved away from AZ and came back after I left, and the other now lives in Columbus, Ohio. I didn't "friend" them, but I did look at their pictures. I was not really close with either of them.
I did find a woman on my list of possible friends who I had been close to in college. We communicate on FB once in awhile. I had not heard from her in 30 years!