Based on facts, either observed and verified firsthand by the reporter, or reported and verified from knowledgeable sources. 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 his native New York to launch Tumblr in 2007, when he was just 20 years old. Tumblr i