Twitter Co-Founders Biz Stone And Ev Williams Address Developers Conference

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Twitter COO Dick Costolo speaks during the first annual Chirp,... Nieuwsfoto'sBedrijfsleven,Californië,Dick Costolo,Financiën,Groot bedrijf,Horizontaal,Internet,Jaarlijks Evenement,Praten,San Francisco - Californië,Sociaal netwerk,Techniek,Twitter,Verenigde StatenPhotographer Collection: Getty Images News 2010 Getty ImagesSAN FRANCISCO - APRIL 14: Twitter COO Dick Costolo speaks during the first annual Chirp, Twitter Developer's Conference April 14, 2010 in San Francisco, California. Chirp, the Twitter Devloper's Conference is a two day event for developers who work with the popular social networking service. (Photo by Justin Sullivan/Getty Images)