You need to feel that you're making a difference.

I tell people in their careers, 'Look for growth. Look for the teams that are growing quickly. Look for the companies that are doing well. Look for a place where you feel that you can have a lot of impact.'

I think now is our time. My mother was told by everyone that she had two choices: She could be a nurse or a teacher. The external barriers now are just so much lower. If we start acknowledging what the real issues are, we can solve them. It's not that hard.

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.

In our performance reviews with women, we need to be saying, "Are you reaching enough? Are you applying for jobs when you meet some of the criteria like men, or are you waiting to meet all the criteria like women do?" There's so much we can do to encourage women to take on more and believe in themselves.

We need to talk more openly about mentorships and sponsorships. Women don't get the mentoring, and particularly the sponsors, they need to succeed as much as men.

As a country and as a world, we are not comfortable with women in leadership roles. We call little girls bossy.