So if vertical social networks become popular, then the horizontal problem becomes intestering, e.g. how to manage one identity across multiple services. OpenID provides authentication, but nothing beyond that. What about profile data ala Google’s form-fill?
How? Consider this – if an OpenID enabled set of tools existed to extend OpenId so that when you registered, a plugin (ala greasemonkey) would run to take your OpenID related profile data and place it into the registration.
It would require a community of trusted “registration plugins” to be created that used your augmented OpenID data.