20 Social Networks and Online Communities for Gamers

# what's hot in the world of social interaction around online and offline gaming (*Source from: Rizwan Tayabali's Blog) 

Boonty - Social Casual Gaming. Creators of Cafe.com
Conduit Labs - Social networking through gaming
Doof.com - Integrating casual gaming with social networks
Eurogamer - Largest independent gaming website and forum in Europe
Cafe.com - Casual gaming site with enhanced social networking capabilities
Gamervision - Gamer Community By Gamers, For Gamers
GAX - The Gamers Social Network
GuildCafe - Network for online gamers
Koinup - Join up your lives in different virtual worlds
Mytopia - First online social gaming community
Wiitube - Nintendo Wii community with videos and news
Nonoba.com - Multi-player online games forum
PlayerHousing - Show off your virtual self and meet others who share your interests in games and virtual worlds
Rupture - Connecting gamers around the world
SGN (Social Gaming Network) -Games and a social gaming platform that leverages people’s social connections
Sparter - Gamer to Gamer Marketplace
UGAME - Social Network for Gamers (still in closed Beta)
WarcraftSocial.com - Social network for Warcraft players
Steam - PC Gaming Community
Zynga - Network of gaming applications built off of classic games like Poker, Battleship, and Attack! that live on social networks like Facebook and Bebo

Update:

Playfish - Social Game Developer, Titled, "Who Has the Biggest Brain?"