Facebook, MySpace, LastFM... would work, if everyone you knew was a member. Problem is that is never going to happen. The thing is that social networks are walled gardens, built so that your data once in, stays in.

I want to retain ownership of my data! If I want sign up to a new better service next week I dont want to have to resubmit everything again, similarly the week after. Why can't my social networks be social?

XFN could be the way. Using microformats to tag the relationship between the content I own on the net. This is the best article I've seen to explain it, so come on Facebook, give me my data back...

Comments? Tweet me @mealybar, smoke signals, or homing pigeon, or something :)