Evan Williams and Biz Stone The Twitter Revolution The brains behind the Web's hottest networking tool.

By MICHAEL S. MALONE

San Francisco

"Twitter is the side project that took," says company co-founder Biz Stone, 35. "Now it's our chance to do something transformative."
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When I arrive at Twitter's headquarters on a recent morning, Jerry Brown is waiting in the lobby -- just another day at the world's hottest high-tech company. "It's pretty bizarre," says co-founder Evan Williams, 37. "At least once per day we look at each and say, 'What the hell?' It's like we're living out the script of the ultimate start-up company story."

But other than the familiar face of California's attorney general standing near the steel front door, you would hardly know that this little company of about 30 employees is the epicenter of the Web, used by an estimated 20 million Americans on a daily -- even minute-by-minute -- basis. Just how fast Twitter is growing is a company secret, but its traffic appears to be more than doubling every month.

The company itself seems calm and casual. The employees drift in, grab some free food and eventually make their way to their desks. It's located in an anonymous warehouse just a couple blocks from South Park, the once-frenzied environs of the dot-com companies of the first Internet boom. In his sports shirt and slacks, sipping a bottle of apple juice, Mr. Williams exhibits indifference to the trappings of success. So does Mr. Stone, who last year won an Oxford Union debate wearing a borrowed bow tie and a pair of black sneakers.

The company is hiring like crazy -- it expects to double its size in the next month or two -- and is also adding a senior management, notably new vice-president of global operations Santosh Jayaram, hired away from Google. "We've never had a company that grew past 15 to 20 people," says Mr. Stone, "We're kind of excited about that."

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