OpenID and the Friend of a Friend social network problem

I've been reading some of the Google Groups about social network portability, and this was an interesting side from David Recordon.

Surely there's got to be a lot of leg room for OpenID as the data carrier of some kind of FOAF micro-format? OpenID can be extended, and if everyone moves towards OpenID as the authentication method of choice, surely that can be represented as a node in the social graph.

Something work thinking about methinks...