Published Dec 08, 2010 at 10:30 AM EST Updated Dec 09, 2010 at 12:16 PM EST David Karp, founder of Tumblr, at the Social Media Rock Star panel in Los Angeles in January. Charley Gallay / WireImage-Getty Images David Karp hardly has the conventional profile of a CEO. He dropped out of high school at the age of 15, heading to Tokyo to work for UrbanBaby, an online parenting site, then moved back to
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