Geography of the internet industry

I found it interesting that San Francisco was such a hotbed of internet activity, I knew it was a big technology city but not extremely bigger than New York City and Chicago. The statistics are really amazing, especially in the graphs when comparing San Francisco to the rest of the U.S. The fact that 30 percent of all venture capital is spent in San Fran. is astounding. I would like to look at the statistics comparing San Fran. to other cities around the world in internet activity just to see if it's a huge gap everywhere. The difference in "smart" and "dumb" money is also intriguing, in that the connections people have is just as important as actual money supply.