Facebook now is mostly about people you know. In the future it could be about people you know less but are more important.

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.

The hardware and the software used in the Breakthrough project will be compatible with other telescopes around the world, so they too can search for intelligent life.

I'm trying to learn from various corners of the world.

The largest newspaper in the United States is only reaching 1 percent of population. We are kind of assuming that 'Wall Street Journal,' 'USA Today,' and other newspapers are very important. Yes, they're extremely important, but only to 1 percent of the population on a daily basis.

It is hard to think of practical applications of the black hole. Because practical applications are so remote, many people assume we should not be interested. But this quest to understand the world is what defines us as human beings.

Social is a better way to interact with digital world. It is better than search. Implications for... everything. Total change.