The interesting thing about Friendster is that it was recently bought for around $100 million. Not Facebook returns, but not bad.
A few of the $100 million articles:
http://www.brandrepublic.com/News/973571/Friendster-bought-1...
http://mediamemo.allthingsd.com/20091210/friendsters-caution...
http://www.itproportal.com/portal/news/article/2009/12/4/unk...
http://www.thetechherald.com/article.php/200949/4892/Friends...