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“Wouldn’t it be fun to build a billion-dollar business in six months?” That question, posed by Facebook Co-Founder and CEO Mark Zuckerberg to Director of Engineering Andrew Bosworth in May 2012, during a walk around the social network’s campus in Menlo Park, Calif., sparked the company’s overhaul of its advertising infrastructure, and it marked just one of the anecdotes included in a wide-ranging, detailed story for The Wall Street Journal by Evelyn M. Rusli.

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