I'd seen mention of FOAF, aka Friend of a Friend, on a few weblogs, but hadn't known really what it was till I started reading up on it this morning. The idea of it is that you can have a file that says who you are and who you know. Then it's possible to make links between people. One issue I have with it is that it seems to include having your email address. With the amount of spam going around the last thing I want to do is have my email address in plaintext where anyone can just grab it. I think there is a way to store your email address encoded, but I haven't quite figured it out yet. If I do, then maybe I'll look into this more.