Mayor Edwin Lee And Twitter Co-Founder Jack Dorsey Hold A...

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Jack Dorsey, chairman and co-founder of Twitter Inc., listens during... News PhotoCalifornia,Chairperson,Finance,Founder,Government,Horizontal,Jack Dorsey,Listening,Meeting,North America,Online Messaging,Politics,Press Conference,San Francisco - California,Social Networking,Summit,Technology,The Americas,The Internet,Twitter,USAPhotographer Collection: Bloomberg 2013 BloombergJack Dorsey, chairman and co-founder of Twitter Inc., listens during a press conference in San Francisco, California, U.S., on Friday, June 14, 2013. Dorsey, Mayor Bloomberg and Mayor Lee announced today that they will co-host the second annual Bloomberg Technology Summit to be held in New York on September 30. Photographer: David Paul Morris/Bloomberg via Getty Images