Feeling confident - or pretending that you feel confident - is necessary to reach for opportunities. It's a cliché, but opportunities are rarely offered; they're seized.

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.

All of us want the same things. We want to be good to the people around us and for our lives to have meaning. For me that means making the world a little bit easier for women.

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.

I am saying that I was able to mold those hours around the needs of my family, and that matters. And I really encourage other people at Facebook to mold hours around themselves.

We're focused on doing one thing incredibly well. If you look at other companies, all of these companies are doing a lot of different things but we're still, as we grow, doing exactly one thing.

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