Mark Zuckerberg did not invent Facebook because he wanted to find a new way of connecting millions of people all over the world. Nor did he found his multibillion-dollar company solely for the money, judging by his trademark jeans and hoodie sweatshirt. He did it, author Ben Mezrich implies in The Accidental Billionaires, because he wanted to show up a girl who dumped him and the guys in Harvard's most elitist social club. The desire to prove he was smarter than them gave Zuckerberg the motivation he needed to start on a path toward becoming one of the world's preeminent innovators.