1999
Live Journal, Asian Avenue, Black Planet, Lunar Storm;
2000
Mi Gente;
2001
Cyworld, Ryze;
2002
Fotologj, Friendster, Skyblog;
2003
Couchsurfing,
LinkedIn, Tribe.net, Open BC/Xing,
MySpace, Last.FM, Hi5, Orkut, Dogster;
2004
Flickr, Piczo, Mixi, Facebook (only in Harvard University), Multiply, aSmallWorld, Dodgeball, Care2 (social network site was added), Catster, Hyves;
2005
2006
Facebook,Windows Live Spaces, Cyworld, Twitter,
MyChurch were added.