Benwerd has thoughts on the new Facebook Timeline feature: The Facebook Timeline is the nearest thing I've seen to a digital identity (and it's creepy as hell).
I have to agree with Jeff Jarvis on the last This Week in Google (link) as to the "what is 'creepy'?" question, but that's another thing. If you're interested you can turn on the facebook timeline right now. Note that if you do turn it on it looks like it replaces (or at least augments) your profile page with the timeline (or something like that).