A lot of the time the experts, the people who are supposed to be able to tell you what to do, will tell you that you can't do something even when you know you can. And a lot of the time it's your friends ... who tell you you can do it.

People developed planes first and then took care of flight safety. If people were focused on safety first, no one would ever have built a plane.

This is our commitment to users and the people who use our service, is that Facebook's a free service. It's free now. It will always be free. We make money through having advertisements and things like that.

The thing that we are trying to do at Facebook is just help people connect and communicate more efficiently.

Facebook is inherently viral.

VR is a very intense visual experience and having the most powerful PC is the only way to deliver certain experiences.

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.