I think top scientists need to be compensated at a different scale in society. Somebody with experience will tell you that true scientists are not motivated by money - they are motivated by the quest itself. That is true. But I think an additional recognition will not hurt.

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 polling of Internet users shows that friends recommendations are the most reliable driver behind purchasing decisions. Right now that market is largely untapped. Facebook and other social networks can allow that to happen.

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?

I'm just focused on exploring new opportunities.

Facebook is at the forefront. It's the company that can fundamentally change the way information is being exchanged and processed. It can be the basis for artificial intelligence to develop over time.

Facebook can be an accumulation of different intelligences. Ask a question, translated into many languages and somebody, somewhere in the world, will have an answer.