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

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Twitter COO Dick Costolo announces the new Twitter Promoted Tweets... Nieuwsfoto'sBedrijfsleven,Bestof,Californië,De media,Dick Costolo,Economie,Financiën,Horizontaal,Internet,Jaarlijks Evenement,Nieuw,Online Messaging,San Francisco - Californië,Sociaal netwerk,Sport,Thema,Twitter,Verenigde StatenPhotographer Collection: Getty Images News 2010 Getty ImagesSAN FRANCISCO - APRIL 14: Twitter COO Dick Costolo announces the new Twitter Promoted Tweets 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)