But the upside of painful knowledge is so much greater than the downside of blissful ignorance.

If you ask men why they did a good job, they'll say, 'I'm awesome. Obviously. Why are you even asking?' If you ask women why they did a good job, what they'll say is someone helped them, they got lucky, they worked really hard.

Fear is at the root of so many of the barriers that women face. Fear of not being liked. Fear of making the wrong choice. Fear of drawing negative attention. Fear of overreaching. Fear of being judged. Fear of failure. And the holy trinity of fear: the fear of being a bad mother/wife/daughter.

Women have made tons of progress. But we still have a small percentage of the top jobs in any industry, in any nation in the world. I think that's partly because from a very young age, we encourage our boys to lead and we call our girls bossy.

We've got to get women to sit at the table.

The things that hold women back, hold them back from sitting at the boardroom table and they hold women back from speaking at the PTA meeting.

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.