Hmm, maybe that's what Diaspora should have been building - an open protocol for exchanging users' 'social' data, meaning you could migrate your FaceFriend account straight onto MyBook without setting anything up, or you could add friends from completely different services into your feed just so long as the same SOA was maintained across companies.

Facebook could do this themselves to stop anyone else ever getting a large share of the market (destroy the barriers for entry).