FORTUNE's annual ranking of America's leading businesswomen


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8. Sheryl Sandberg
Sheryl Sandberg
COO
Facebook
2011 rank: 12
Age: 43
As Facebook's No. 2, Sandberg was a central player in its high-profile -- and problematic -- IPO. She joined the board shortly after and is responsible for the company's moneymaking strategy. Also on the board of Disney, Sandberg is a vocal advocate for young women at work. Expect a book on the subject in 2013.
From the October 8, 2012 issue
How we pick the Power 50
The list is compiled by FORTUNE editors, who consider four criteria: the size and importance of the woman's business in the global economy, the health and direction of the business, the arc of the woman's career (resume and runway ahead), and societal and cultural influence.