The success of Facebook is because we empowered people. We gave people a way to share their opinion online that a lot of people didn't have before, and to connect with people that they didn't have before and that is why we have been so successful.

I think that there is a role that Facebook can play in empowering community leaders, to strengthen existing communities, to help build new communities, to help look out for people in their community, to help keep people safe.

We want Facebook to be one of the best places people can go to learn how to build stuff.

At Facebook, we build tools to help people connect with the people they want and share what they want, and by doing this we are extending people's capacity to build and maintain relationships.

A lot of times, I run a thought experiment: 'If I were not at Facebook, what would I be doing to make the world more open?'

No one has done a study on this, as far as I can tell, but I think Facebook might be the first place where a large number of people have come out. We didn't create that - society was generally ready for that. I think this is just part of the general trend that we talked about, about society being more open, and I think that's good.