Sheryl Sandberg, Mark Zuckerberg's 'Most Valuable Friend'

Meet Facebook's 'Most Valuable Friend'

If all of that sounds a bit touchy-feely, well, it is. Ms. Sandberg, a well-regarded Internet executive, is known for her interpersonal skills as much as for her sharp intellect. And her regular meetings with the famously introverted Mr. Zuckerberg have helped to keep one of Silicon Valley's most unusual business partnerships working wonders for Facebook.

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