The name I wanted wasn't available and I haven't bothered to find anything else I'd use so it's numbers for me too. But I don't really use Facebook for anything except approving friend requests I get.
http://www.facebook.com/profile.php?id=100000081225249
I have this too...
https://twitter.com/SimonStern
But I don't use that either.
I've never been accused of being Social.