Jack Dorsey

Benjamin Wachenje

Title: Chairman and co-creator, Twitter; CEO, Square

Born: November 19, 1976, St. Louis, Missouri

Education: New York University (dropped out)

Early Marker: Created open-source logistics software for taxi dispatch.

Big Idea: Microblogging and messaging in 140 characters; now working on platform for small businesses to accept card payments on a mobile device.

Wave of the Future: M-economy, App-economy, social media

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CNBC25: Rebels, Icons and Leaders