Twitter CEO Dick Costolo (C) stands with Twitter co-founders Jack Dorsey (R), Biz Stone (2nd R) and Evan Williams (2nd L) as Twitter CFO Mike Gupta (L) looks on after the Twitter Inc. IPO on the floor... more 
Twitter CEO Dick Costolo (C) stands with Twitter co-founders Jack Dorsey (R), Biz Stone (2nd R) and Evan Williams (2nd L) as Twitter CFO Mike Gupta (L) looks on after the Twitter Inc. IPO on the floor of the New York Stock Exchange in New York, November 7, 2013. REUTERS/Lucas Jackson (UNITED STATES - Tags: BUSINESS SCIENCE TECHNOLOGY) less 
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Reuters | Photo By LUCAS JACKSON / REUTERS
Thu, Nov 7, 2013 1:05 PM EST