Twitter, the 140-characters at a time blogging service, was shaped by its founder's dry, understated sense of humor. The company, not to mention the service, seems to be a sort of Silicon Valley inside joke that, improbably, Ev Williams and his fellow Twitterers have managed to play on the rest of the world. For this, Sarah Lacy labels Williams a "nontrepreneur." Fittingly, Sarah Lacy gave his microcompany got a mere four pages in her new book, Once You're Lucky, Twice You're Good:

Previously:

• A is for Adelson, who cofounded Digg
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• B is for Botha, who sold YouTube big
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• F is for Fitzpatrick, and "hookers and blow"
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• L is for Levchin, who never goes slow
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• P is for Parker, the Valley's bad boy
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• R is for Rose, who made Digg his toy
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