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I have invested in four social networks. More than any other. But that's in Russia and Poland.

The reason the social-networking phenomenon is something that I invested in early and massively - I led the Series A financing for Friendster; I founded a company called Socialnet in 1997; I founded LinkedIn; and I was part of the first round of financing in Facebook - it sounds trivial, but people matter.

There is a significant momentum behind the social Internet. A wide range of public investors were very enthusiastic about that.

I used to share my everyday life on the first social media platforms, and I had a pretty big following.

I have to say there are a lot of me-too products and companies. Yet another social network, of the 15th flavor - that's common in every new technology revolution. There are imitators who have marginal improvements.

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.

I'm invested in about 13 private companies. I've advised probably another 50 private companies.

Facebook has stitched together your social graph. The idea of an interest graph is to bring together everyone that has shared interests. If I can isolate the people who are into mountain biking in Marin, in one place, the ability to put ads against that is really high.

I have a tremendous network of friends and colleagues at other firms.