Ultimate List of Social Networks

Mar 13 -- I'm starting a list of social networking sites.  Notable social networks with good traffic.  Here's the starter list.  What am I missing?

U.S.A. - Bebo, Facebook, Flickr (pics), Friendster, Hi5, MOG, MSN Spaces, MySpace, MyYearBook, Orkut, Piczo, Sconex, Tagworld, Tribe, WAYN, Xuqa, Yahoo 360, Zorpia

Business Networks - CollectiveX (for groups), Guanxi (China), Ryze (USA), Tianji (China)

Beyond USA - Arto.dk (Denmark), ASmallWorld (Euro), Cyworld (South Korea), Epuls.pl (Poland), EveryonesConnected (UK), Faceparty (UK), Fropper (India), Grono (Poland), Hyves (Netherlands), IRC Galleria (Finland), Mixi (Japan), Nexopia (Canada), Passado (Euro), Playahead (Sweden), ProfileHeaven (UK), Rate.ee (Estonia), Studivz.net (Germany's Facebook), Yeeyoo (China), Yeskee (China), Yonja (Turkey)

Niche - Dogster (uh, dogs!?!), Golfspinner (Golfers), Joga (Soccer), Xianz (Christians), Zaadz (Change the World)

Anti-Social Networks - Isolatr, Snubster

Myspace Add-ons - Blingboo, Coshed, Gotomyproile, Modmyprofile, Myspacehive, Zobbler

New Sites - Dogears.net (US Universities), Palopia (students), Panjea (music, media player)