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David Karp, CEO, Tumblr Inc.

Published on .

What: CEO Where: Tumblr Inc., New York Why: Although blogs have been around a relatively long time, they show signs of getting ever more popular, and blogging site Tumblr is a key reason why. It currently powers more than 58.9 million blogs. Last month, Karp's company launched a brand advertising effort on behalf of Adidas.
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