Just because you can build a machine that is better than a person at something doesn't mean that it is going to have the ability to learn new domains or connect different types of information or context to do superhuman things. This is critically important to appreciate.

This is our commitment to users and the people who use our service, is that Facebook's a free service. It's free now. It will always be free. We make money through having advertisements and things like that.

I don't hate anybody. The Winklevi aren't suing me for intellectual property theft. They're suing me because for the first time in their lives, the world didn't work the way it was supposed to for them.

It is really important for us that people understand what the strategy is and that the real approach is to make everything social, not to build a vertical approach.

The primary things that people do on the Facebook is they use it to share with their friends and the people around them and their community, and they use it to keep in touch with people.

The days of you having a different image for your work friends or co-workers and for the other people you know are probably coming to an end pretty quickly. Having two identities for yourself is an example of a lack of integrity.

People don't care about what someone says about you in a movie--or even what you say, right? They care about what you build.