Hollywood has nothing to do with real life.

It only took me two weeks to build the first version of Facebook because I had so much stuff before then.

Why are most chess masters under 30?

When you give everyone a voice and give people power, the system usually ends up in a really good place. So, what we view our role as, is giving people that power.

Advertising works most effectively when it's in line with what people are already trying to do. And people are trying to communicate in a certain way on Facebook - they share information with their friends, they learn about what their friends are doing - so there's really a whole new opportunity for a new type of advertising model within that.

This is a perverse thing, personally, but I would rather be in the cycle where people are underestimating us. It gives us latitude to go out and make big bets that excite and amaze people.

The companies that work are the ones that people really care about and have a vision for the world so do something you like.