David Cheriton — Canadian Businessman born on March 29, 1951,

David Ross Cheriton is a Canadian computer scientist, mathematician, businessman, and venture capitalist. He is a computer science professor at Stanford University who has investments in technology companies. With an estimated net worth of US$3.3 billion, Cheriton was ranked by Forbes as the 13th wealthiest Canadian and 508th in the world... (wikipedia)

I am a believer in Adam Smith, who says that if you look at something that really contributes value to society, and you can deliver it at a reasonable price, then society will recognise that at some point because rational behaviour will come into play.
I tend to look at potential investments from the standpoint of whether it is a valuable contribution to society.
I must admit that I don't really understand social networking models that well, and I haven't tried to because I have just not been enthused about this whole thing.
There is something about military history that fascinates me. You find that many battles have been lost by people with very good military background when they fought battles in a battleground they didn't understand. I have seen that in business, too. You have to look at a marketplace like a battle-ground.