You really should have a look at linked in. Another great example of social networking/internet collaboration. With little effort I have created 11 direct connections, 200+ 2nd degree contacts, and over 16300+ 3rd degree connections, and it is pretty early days.
It really is pretty amazing concept. Everytime I get another connection I quickly find that I already know quite a few of the people. Combine this with an expertise capability and it is a powerful tool.