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.

Berlin definitely has one of the most vibrant of the startup scenes that I have seen. Not really just across Europe, but across the whole world in terms of cities. It's an interesting dynamic.

The trick isn't adding stuff, it's taking away.

The US government should be the champion for the internet, not a threat. They need to be much more transparent about what they're doing, or otherwise people will believe the worst.

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

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.

Facebook is all about information and helping people share it.