Aiming for perfection causes frustration at best and paralysis at worst.

Both men and women react negatively when women negotiate on their own behalf. A man can just negotiate: "I have a better offer. That's not enough to make my family's ends meet." No one feels bad about it. But when a woman does that, there's a backlash.

There's a lot that needs to be fixed in dating for men and women in the U.S. - there's a lot of pressure on women to do things they may not want to do. And if you start out unequal, you are not going to end up with equality.

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.

Women need to shift form thinking "I'm not ready to do that" to thinking "I want to do that- and I'll learn by doing it.

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

We've ceased making progress at the top in any industry anywhere in the world . In the United States, women have had 14% of the top corporate jobs and 17% of the board seats for 10 years. Ten years of no progress.