If I ever do something like that (I don't really friend much anymore unless I've hung out with someone a few times recently, although I'm thinking I might do at least one more eventually), my reason for friending is usually some sort of feeling of a lost chance, and the reason I don't say anything is fear of rejection (although if you send a message, I will probably respond, probably in at most a week) Usually when I friend someone, I have the hope that maybe we might catch up sometime or it might turn into an opportunity, but I know that it usually doesn't go anywhere. I can get afraid to actually send messages to people who I haven't talked to in a while (or much at all, often times). Thinking about it, it's a little irrational. It doesn't matter too much anymore, though, maybe, because I'm in a little better of a social situation than I was a few years ago.
You can tell how far we have to go, when FORTRAN is the language of supercomputers. -- Steven Feiner