When you have a successful track record building things, it’s a good thing to move on once an item has already been built, so you build something else. Ev could build a life fitness treadmill and make you want to walk on it.

Twitter co-founder Evan Williams stepped down Monday as chief executive, handing over to a Google veteran brought in last year to help the micro-blogging service make money.

Williams, in a post on the company blog, said Twitter’s chief operating officer, Dick Costolo, would take over as CEO of the San Francisco-based startup effective immediately.

Costolo, whose Web content distribution company Feedburner was purchased by Google in 2007, has been at the forefront of efforts to begin monetizing Twitter since he joined the company last year.

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