Friend of a Friend
I now have a FOAF file, which is a machine-readable description of me and who I know. Since it’s machine-readable, you probably can’t understand what it says. You can go to FoaF Explorer to see what the file describes. It currently has nothing relevant yet, but I’m going to try to get a few more people to try it as well. When that happens, this will be quite interesting.
[Update] The FOAF definition is now here as well.