When I started Facebook from my dorm room in 2004, the idea that my roommates and I talked about all the time was a world that was more open.

The world is changing so quickly, with mobile stuff and different platforms emerging, that I think it's more likely that the biggest competitor for Facebook is someone that we haven't heard of. What that means for us is that we should just really stay focused on what we're doing.

Mobile is a lot closer to TV than it is to desktop.

Whenever I go to a new city, in order to help get on the right time zone and actually get a chance to see that city, I like running.

Find that thing you are super passionate about.

People wait until late in their career to give back. But why wait when there is so much to be done?

Helping a billion people connect is amazing, humbling and by far the thing I am most proud of in my life.