When you want to change things, you won't please everyone.

In the future, there will be no female leaders. There will just be leaders.

What about the rat race in the first place? Is it worthwhile? Or are you just buying into someone else's definition of success? Only you can decide that, and you'll have to decide it over and over and over. But if you think it's a rat race, before you drop out, take a deep breath. Maybe you picked the wrong job. Try again. And then try again.

I was grateful that Facebook already had generous bereavement policies . Now Facebook employees receive 20 days paid leave to grieve the loss of an immediate family member and 10 days for an extended family member. I'm proud that we're able to do this and I hope more businesses do the same. Only 60 percent of private sector workers get paid time off after the death of a loved one, and then it's usually just a few days. Workers and families deserve better than that.

Don't let your fears overwhelm your desire. Let the barriers you face-and there will be barriers-be external, not internal. Fortune does favor the bold, and I promise that you will never know what you're capable of unless you try.

But I really believe that when you give people authentic identity, which is what Facebook does, and you can be your real self and connect with real people online, things will change.

Leadership is about making others better as a result of your presence and making sure that impact lasts in your absence." (Harvard Business School definition of leadership)