myspace: 51,441 (thousands, May 2006)
classmates.com: 14,792
facebook.com: 14,069
youtube.com: 12,669
msn spaces: 9,566
xanga.com: 7,146
flickr.com: 5,163
yahoo 360: 4,936
livejournal: 3,904
myyearbook.com: 3,048

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