Three years after Sandberg joined Facebook, the company is profitable.Photograph by Michele Asselin In 2007, the founder of Facebook, Mark Zuckerberg, knew that he needed help. His social-network site was growing fast, but, at the age of twenty-three, he felt ill-equipped to run it. That December, he went to a Christmas party at the home of Dan Rosensweig, a Silicon Valley executive, and as he app
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