Table 1 Launch time of famous online social networks

1997

Six Degrees

1999

Live Journal, Asian Avenue, Black Planet

2000

Lunar Storm, My Gente

2001

CyWorld, Ryze

2002

Fotolog, Friendster, skyblog

2003

Couch surfing, Linked In, MySpace, Tribe.net, Last.Fm, Hi5

2004

Orkut, Dogster, Flicker, Piczo, Mixi, Facebook (Harvard only), Dodgeball, Care2 (relaunch), Catster, Hyves

2005

Yahoo!360, Youtube, Xanga (relaunch), Cyworld, Bebo (relaunch), Facebook (high schools), Ning, Asian Avenue, Black Planet (relaunch)

2006

QQ (relaunch), Facebook (corporate network), Windows live space, CyWorld (U.S), Twitter, MyChurch, Facebook (everyone)