We can each define ambition and progress for ourselves. The goal is to work toward a world where expectations are not set by the stereotypes that hold us back, but by our personal passion, talents and interests.

Facebook is a really exciting place trying to do something really important that I really believe in. And it matters.

We have a problem with women in leadership across the board. This leadership gap - this problem of not enough women in leadership - is running really deep and it's in every industry. My answer is we have to understand the stereotype assumptions that hold women back.

Men feel like they can be a professional and a father. For women it's "or." That's offensive to me. The concept that it's not possible is crazy.

And in situations where a man and a woman each receive negative feedback, the woman's self-confidence and self-esteem drop to a much greater degree. The internalization of failure and the insecurity it breeds hurt future performance, so this pattern has serious long-term consequences.

Guilt management can be just as important as time management for mothers.

Social gains are never handed out. They must be seized.