The question I ask myself like almost every day is: ‘Am I doing the most important thing I could be doing?' Unless I feel like I’m working on the most important problem that I can help with, then I’m not going to feel good about how I’m spending my time. And that’s what this company is.

People can be really smart or have skills that are directly applicable, but if they don't really believe in it, then they are not going to really work hard.

Almost any mistake you can make in running a company, I've probably made

I don't have an alarm clock. If someone needs to wake me up, then I have my BlackBerry next to me.

We have a pretty ambitious goal for the world. What we think will make the Web better. What we think will make all these businesses that integrate with us run more effectively. I think if we stay focused on doing that, that's really the main thing that we need to do.

The thing that we are trying to do at Facebook is just help people connect and communicate more efficiently.

Of course, hate speech and racism have no place on Facebook