Women don't take enough risks. Men are just 'foot on the gas pedal.' We're not going to close the achievement gap until we close the ambition gap.

The gender stereotypes introduced in childhood are reinforced throughout our lives and become self-fulfilling prophesies. Most leadership positions are held by men, so women don't expect to achieve them, and that becomes one of the reasons they don't.

As a man gets more successful, powerful, he is more liked, and as a woman gets more successful, she is less liked, and that's true by both women and men.

At Facebook we feel a lot of affinity not just for this community but for any community that is trying to do what Davos is trying to do, which is to share information. And Davos is doing it in a particular way - I think the Facebook approach is obviously more broad-based, we're trying to include everyone in the world. But the goal is the same: bring people together, to share information and make the world more connected, and have people have a deeper understanding of themselves, others, the communities of which they want to be a part and can be a part.

Our culture needs to find a robust image of female success that is first, not male, and second, not a white woman on the phone, holding a crying baby.

If more women are in leadership roles, we'll stop assuming they shouldn't be.

I want to tell any young girl out there who's a geek, I was a really serious geek in high school. It works out. Study harder.