We've changed our internal motto from "Move fast and break things" to "Move fast with stable infrastructure."

I literally coded Facebook in my dorm room and launched it from my dorm room. I rented a server for $85 a month, and I funded it by putting an ad on the side, and we've funded ever since by putting ads on the side.

Companies face a handful of different risks, whether it is competitors or different market environments. But I think that people focus way too much on competitors and not enough on their own execution.

What really motivates people at Facebook is building stuff that they're proud of.

I like to pride myself on thinking pretty long term, but not that long term.

The world isn't set up equally, and the first billion people using Facebook have way more money than the rest of the world combined.

A squirrel dying in front of your house may be more relevant to your interests right now than people dying in Africa.