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Zuck drops "the" from the company name after snatching the URL Facebook.com for $200,000. That same year, Facebook expands beyond colleges to high schools and goes international. Number of users as of May: over 5.5 million.

By JP Mangalindan @FortuneMagazine - Last updated May 18 2012: 5:55 AM ET
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Facebook's wild, nascent summer of 2004 was loosely chronicled in the blockbuster The Social Network. This is what it was really like.