Twitter co-founder Evan Williams steps down as CEO

SAN FRANCISCO (AP) - October 4, 2010

The privately held company announced the change in command Monday.

Costolo, an early investor in Twitter, joined the company as chief operating officer a year ago to help manage Twitter's rapid growth.

Since then, Twitter has moved into a larger headquarters in San Francisco as its payroll swelled from a few dozen workers to 300 employees.

Twitter launched in 2006. Williams became CEO in 2008, after Twitter's board decided he was better equipped for job than another co-founder, Jack Dorsey.

Williams will remain at Twitter and focus on developing new products.

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