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BtoB

Jack Dorsey, Executive chairman, Twitter Inc.

Published on .

What: Executive chairman Where: Twitter Inc., San Francisco Why: Dorsey's blogging service has more than 500 million users worldwide and, over the past year, has dramatically ramped up its ad offerings of promoted tweets, promoted trends and promoted accounts. This spring, the company launched expanded tweets, a partnership program with media companies that allows viewers to preview linked stories and videos.
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