Oprah's Next Chapter:

What Kept Facebook COO Sheryl Sandberg Up at Night?

Sheryl Sandberg admits that when she first accepted the chief operating officer position at Facebook, the world's largest social network, the pressure to make the company what it needed to be kept her up at night. Watch as Sheryl shares her initial concerns about working with Facebook founder and CEO Mark Zuckerberg, a man 15 years her junior.

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