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16. Sheryl Sandberg
2009 rank: 22
Age: 41

Sandberg has been key in turning the social network's more than 500 million users into revenue. This year her team got advertisers to up their spending on the site. She has also burnished her résumé; with seats on the boards of Disney and Starbucks.

NEXT: Carol Meyrowitz
Last updated September 30 2010: 2:47 PM ET
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