So I dare you all 2................
Post this in your journal, asking your friends list (or whatever stranger that happens to wander by) to respond with whatever they know about you. It can be as matter of fact as "Your name is Jim, you pet dogs," or as random as you like: "You used to hang with mongols and filkers."
A week later, write an "about me" post to fill in the gaps in your friends' knowledge.
Addendum from me: Please feel free to use the anonymous or better yet SCREENED comments. No, really. You can. :)