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BtoB

David Karp,CEO, Tumblr Inc.

Published on .

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What: CEO Where: Tumblr Inc., New York Why: Karp's microblogging startup Tumblr gained immediate validation this year after its acquisition by Yahoo. Tumblr's new mobile ads, appearing in the form of sponsored native ads rather than banners, will gain even greater exposure through the reach of its new parent.
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