Social media has created a historical shift from the historically powerful to the historically powerless. Now everyone has a voice.

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.

For any of us in this room today, let's start out by admitting we're lucky. We don't live in the world our mothers lived in, our grandmothers lived in, where career choices for women were so limited.

When I went to college, as much as my parents emphasized academic achievement, they emphasized marriage even more. They told me that the most eligible women marry young to get a 'good man' before they are all taken.

Let's acknowledge that men reach for opportunities more quickly and more easily than women. So often as managers, we give the job to whoever starts solving the problem, to whoever jumps in. Since we know men will jump in faster than women in so many circumstances, we have to slow down and encourage more women to sit at more tables.

It's easy to dislike the few senior women out there. What if women were half the positions in power? It would be harder to dislike all of them.

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