I think that people just have this core desire to express who they are. And I think that's always existed.

In a world that's changing so quickly, you're guaranteed to fail if you don't take any risks.

Openness fundamentally affects a lot of the core institutions in society - the media, the economy, how people relate to the government and just their leadership.

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.

I hope that Facebook and other Internet technologies were able to help people, just like we hope that we help them communicate and organize and do whatever they want to every single day, but I don't pretend that if Facebook didn't exist, that this wouldn't even be possible. Of course, it would have.

Simply put: we don't build services to make money; we make money to build better services.

The thing I really care about is the mission, making the world open.