Science is one of a handful of things that defines us as a very special species. It is amazing how far we have been able to get and how accurate our predictions are. I think understanding how the universe was born is very important. It really gives us a perspective on many things.

Facebook can be an accumulation of different intelligences.

Facebook is a platform inside a platform.

I must analyze, from what I do now, what will be the impact two or three or five years in the future. What is the statement I want to make?

The company that creates one global social graph will be very important going forward. It will be Facebook, with maybe 2-3 local social networks able to sustain competition long term.

Fundamental physics is like an art more or less. It's completely non-practical, and you can't use it for anything. But it's about the universe and how the world came into being. It's very remote from your daily life and mine, and yet it defines us as human beings.

Facebook didn't know how successful Zynga would be.