MySpace.com attracted more than 114 million global visitors age 15 and older in June 2007 (+plus 72 % since June 2006)
Facebook.com has grown to 52.2 million visitors (plus 270 %)
Bebo.com now has 18,2 Mio. (plus 172 %) and
Tagged.com got to 13,2 mio. vistors (up 774 %)
... more
But how the are doing in different regions?
Source: comScore World Metrix
Total Worldwide Home/Work Locations Among Internet Users Age 15+
More result on Social Networking from comScore Press release (31-July-2007)