IMAGE DISTRIBUTED FOR HULT INTERNATIONAL BUSINESS SCHOOL - Biz Stone, co-founder of Twitter, Inc, speaks at Hult International Business School's Executive Speaker Series in San Francisco, CA on Tuesday, Oct. 16, 2012. (Ryan Anson/AP Images for Hult International Business School)

Associated Press
IMAGE DISTRIBUTED FOR HULT INTERNATIONAL BUSINESS SCHOOL - Biz Stone,  co-founder of Twitter, Inc, speaks at Hult International Business School's Executive Speaker Series in San Francisco, CA on Tuesday, Oct. 16, 2012. (Ryan Anson/AP Images for Hult International Business School)
IMAGE DISTRIBUTED FOR HULT INTERNATIONAL BUSINESS SCHOOL - Biz Stone, co-founder of Twitter, Inc, speaks at Hult International Business School's Executive Speaker Series in San Francisco, CA on Tuesday, Oct. 16, 2012. (Ryan Anson/AP Images for Hult International Business School)
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