Aggressive and hard-charging women violate unwritten rules about acceptable social conduct. Men are continually applauded for being ambitious and powerful and successful, but women who display these same traits often pay a social penalty. Female accomplishments come at a cost.

I go around the room and ask people, 'What do you think?'

Most people assume that women are responsible for households and child care. Most couples operate that way - not all. That fundamental assumption holds women back.

Speak up. Believe in yourself. Take risks.

It is the ultimate luxury to combine passion and contribution. It's also a very clear path to happiness.

When I went to college, as much as my parents emphasized academic achievement, they emphasized marriage even more. They told me that the most eligible women marry young to get a 'good man' before they are all taken.

I'd worked on leprosy and malaria in India [at the World Bank] and asked myself the question: Why do we let 2 million children die every year around the world for not having clean water? Because they're faceless and nameless. So, for me, Facebook looked like it was going to solve the problem of the invisible victim.