I think things like linked-in, facebook, twitter can all be faked. Just because a profile shows a name, doesn't mean it is real.
True, I'm thinking I would show the number of connections to make it harder to fake. And then the social side is just 1 aspect.
The sharing of credibility is a good one. bitcoin-otc.com does this to an extent, but requires GPG to prove that you are you each time you want to authenticate with the bot. GPG doesn't prove a real world identity, it merely validates your online identity is the same each time. A person can still have multiple GPG accounts.
Thanks for pointing me to that. I guess that's what I'm trying to do, but rather then storing the things that make you credible in 1 market place. You can carry that credibility into others.