Grief comes and goes, it ebbs and flows. I think one of the lessons of this for me is that there's no one way to grieve. Everyone does it in their own way, in their own time, and we all process life and its challenges and its ups and downs as they come.

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

You know, there has never been a 24-hour period in five years when I have not responded to e-mail at Facebook. I am not saying it's easy. I work long hours.

The gender stereotypes introduced in childhood are reinforced throughout our lives and become self-fulfilling prophesies. Most leadership positions are held by men, so women don't expect to achieve them, and that becomes one of the reasons they don't.

When we get feedback on women, we ask, "Is that real or is that the gender bias at play?" Everyone could start doing that today and I think we'd see really big results.

At Facebook, we try to be a strengths-based organization, which means we try to make jobs fit around people rather than make people fit around jobs. We focus on what people's natural strengths are and spend our management time trying to find ways for them to use those strengths every day.

So please ask yourself: What would I do if I weren't afraid? And then go do it.