The social media companyís ad revenue could reach nearly $4 billion in 2011, thanks to Facebookís savvy operating chief. Sandberg also sits on the boards of Disney and
Starbucks, and has emerged as a leading advocate for women in the workplace. Next up: a critical role in Facebookís highly anticipated IPO.
The list is compiled by FORTUNE editors, who consider four criteria: the size and importance of the womanís business in the global economy, the health and direction of the
business, the arc of the womanís career (resume and runway ahead), and societal and cultural influence.