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.

I have never met a woman, or man, who stated emphatically, "Yes, I have it all.'" Because no matter what any of us has—and how grateful we are for what we have—no one has it all.

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.

A truly equal world would be one where women ran half our countries and companies and men ran half our homes.

We need to talk more openly about mentorships and sponsorships. Women don't get the mentoring, and particularly the sponsors, they need to succeed as much as men.

After my husband, Dave, died, I called my friend Adam, a psychologist who studies how people find meaning in our lives, and I asked him what, if anything, I could do to help myself and my kids get through this. We started talking about resilience, then reading about it, then talking to other people who had gotten through grief and other huge challenges. In time, those conversations and that research helped me heal.

If I didn't write in my journal every couple of days, I felt like I was going to burst. Later I learned the research about how important journaling can be to recovering from trauma and grief. That was definitely true for me.