http://www.crunchbase.com/company/facebook

...This website talks about how facebook began and about all its rising success from 2004 till now. It also describes how the facebook users have risen to 50 million people. Take a look yourself...

http://ee.usatoday.com/SUBSCRIBERS/LandingPage/LandingPage.aspx?href=VVNBLzIwMTAvMDIvMTA.&pageno=LTE.&entity=QXIwMzYwMA..&view=ZW50aXR5

http://ee.usatoday.com/SUBSCRIBERS/LandingPage/LandingPage.aspx?href=VVNBLzIwMTAvMDIvMTA.&pageno=MQ..&entity=QXIwMDEwNg..&view=ZW50aXR5

http://www.checkfacebook.com/