If we want to have the biggest impact, the best way to do this is to make sure we always focus on solving the most important problems.

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.

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

I think that the tax situation needs to be worked out between the countries themselves.

I think there's confusion around what the point of social networks is. A lot of different companies characterized as social networks have different goals - some serve the function of business networking, some are media portals. What we're trying to do is just make it really efficient for people to communicate, get information and share information.

AI systems will enable doctors to diagnose diseases and treat people better, so blocking that progress is probably one of the worst things you can do for making the world better.

Advertising works most effectively when it's in line with what people are already trying to do.