[NickNameNick]

I saw a really cool demonstration at an old Kiwicon event.

The presenter had a tool that would find similar social graphs across multiple bulletin boards and other social sites.

Eg: You'd feed in the profile of your user-of-interest on one bulletin board, and it would map their social graph on that site, then it would search for similar profiles from the entire graph on other boards. Reconstruct the graphs on the new boards, attempting to match dissimilar accounts for the same underlying persons across sites.