Jack Dorsey, chairman and co-founder of Twitter Inc., center, speaks as New York City Mayor Michael "Mike" Bloomberg, right, and San Francisco Mayor...
Jack Dorsey, chairman and co-founder of Twitter Inc., right, speaks with New York City Mayor Michael "Mike" Bloomberg, left, as San Francisco Mayor...
San Francisco Mayor Edward "Ed" Lee, left, speaks as Jack Dorsey, chairman and co-founder of Twitter Inc., after a press conference in San Francisco,...
Jack Dorsey, chairman and co-founder of Twitter Inc., left, speaks to the media as New York City Mayor Michael "Mike" Bloomberg, right, and San...
San Francisco Mayor Edward "Ed" Lee, center, speaks as Jack Dorsey, chairman and co-founder of Twitter Inc., left, and New York City Mayor Michael...
Jack Dorsey, chairman and co-founder of Twitter Inc., listens during a press conference in San Francisco, California, U.S., on Friday, June 14, 2013....
Jack Dorsey, chairman and co-founder of Twitter Inc., listens during a press conference in San Francisco, California, U.S., on Friday, June 14, 2013....
Jack Dorsey, chairman and co-founder of Twitter Inc., left, and and San Francisco Mayor Edward "Ed" Lee, right, laugh as New York City Mayor Michael...
Jack Dorsey, chairman and co-founder of Twitter Inc., left, and and San Francisco Mayor Edward "Ed" Lee, right, laugh as New York City Mayor Michael...
Jack Dorsey, chairman and co-founder of Twitter Inc., center, speaks as New York City Mayor Michael "Mike" Bloomberg, right, and San Francisco Mayor...
Jack Dorsey, chairman and co-founder of Twitter Inc., from left, New York City Mayor Michael "Mike" Bloomberg and San Francisco Mayor Edward "Ed" Lee...