The players at Twitter

Meet the cast of characters behind the micro-blogging machine.

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Jack Dorsey
Age: 34

Title: Co-founder and executive chairman, Twitter; founder and CEO, Square; board member at both companies

Dorsey invented Twitter and was its first CEO. He returned as product guru in March.

By Jessi Hempel, senior writer

NEXT: Evan Williams
Last updated April 14 2011: 5:14 AM ET
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