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.

A lot of people will say, "what's Facebook's business model?" I always find that a kind of funny question. Our business model is out there, which is: we monetize largely through advertising and a little bit through the gift revenue, the virtual gifts we have on our site. I think those continue to be the most promising avenues going forward.

But I really believe that when you give people authentic identity, which is what Facebook does, and you can be your real self and connect with real people online, things will change.

But the upside of painful knowledge is so much greater than the downside of blissful ignorance.

The most important thing we're doing differently is that we talk openly about gender at Facebook.

In those same 10 years, women are getting more and more of the graduate degrees, more and more of the undergraduate degrees, and it's translating into more women in entry-level jobs, even more women in lower-level management. But there's absolutely been no progress at the top. You can't explain away 10 years. Ten years of no progress is no progress.

I have never worked for a woman, and I have never worked with a lot of women.