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

Keywords

Twitter COO Dick Costolo speaks during the first annual Chirp,... News PhotoAnnual Event,Business,California,Corporate Business,Dick Costolo,Finance,Horizontal,San Francisco - California,Social Networking,Talking,Technology,The Internet,Twitter,USAPhotographer 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)