Facebook is inherently viral.

Google, I think, in some ways, is more competitive and certainly is trying to build their own little version of Facebook.

I would only hire someone to work directly for me if I was willing to work for that person.

Building a mission and building a business go hand-in-hand. It is true that the primary thing that makes me excited about what we're doing is the mission, but I also think, from the very beginning, we've had this healthy understanding which is that we need to do both.

If you don't risk anything you risk everything

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

Facebook was not originally created to be a company. It was built to accomplish a social mission - to make the world more open and connected.