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Twitter
Twitter
Far from a Fortune 500 company in size, the 36-person startup is now one of the most-talked-about technologies in the world. As the two-year-old micro-blogging site takes hold, big businesses like Dell (No. 33) and Comcast (No. 68) are finding ways to use Twitter to move inventory, market themselves, and monitor customer complaints.

From left: Evan Williams, CEO and co-founder, Twitter; Fred Wilson, principal, Union Square Ventures; Bijan Sabat (top middle), general partner, Spark Capital; Biz Stone, co-founder, Twitter; Ted Wang (board observer), partner, Fenwick & West; Peter Fenton, general partner, Benchmark Capital; Jack Dorsey (jumping), co-founder, Twitter

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Last updated April 23 2009: 4:10 PM ET
2009 Fortune 500
Top 50
Top 50
Exxon Mobil pushes Wal-Mart aside to retake the No. 1 slot this year. Which other companies made the top 50 this year? More
They're hiring!
They're hiring!
As many big companies are announcing mass layoffs, these Fortune 100 employers have at least 150 openings each. More
The biggest losers
The biggest losers
Companies from AIG to United Airlines, from ConocoPhillips to Motorola lost billions of dollars last year. Who lost the most? More
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