Jack Dorsey, chairman of Twitter and CEO of Square, takes part in a Techonomy Detroit panel discussion held at Wayne State University in Detroit, Michigan September 17, 2013. REUTERS/Rebecca Cook ... more 
Jack Dorsey, chairman of Twitter and CEO of Square, takes part in a Techonomy Detroit panel discussion held at Wayne State University in Detroit, Michigan September 17, 2013. REUTERS/Rebecca Cook (UNITED STATES - Tags: BUSINESS SCIENCE TECHNOLOGY) less 
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Reuters | Photo By REBECCA COOK / REUTERS
Tue, Sep 17, 2013 7:05 PM EDT