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The ultimate insider look at the newest titans of tech—and what you can learn from their success In 2007, twenty-one-year old David Karp launched Tumblr, a simple micro-blogging platform, on a whim. By 2012, it had become one of the top ten online destinations, drawing 170 million visitors. By 2013, Yahoo had acquired Tumblr for over $1 billion. Just like that, a kid who hadn’t even earned his high school diploma was worth over a quarter billion dollars. And he’s not the only one . . . Silicon Valley’s newest billionaires represent a unique and unconventional breed of entrepreneur: young, bold, and taking the world by storm with their extreme speed, insatiable hunger, and progressive leadership. These whiz kids (and, to be fair, a few adults) have the hottest companies in the world.