This groundbreaking book analyses the geography of the commercial Internet industry. It presents the first accurate map of Internet domains in the world, by country, by region, by city, and for the United States, by neighborhood. It demonstrates the extraordinary spatial concentration of the Internet industry. It explains the geographic features of the high tech venture capital behind the Internet economy. It demonstrates how venture capitalists' abilities to create and use tacit knowledge contributes to the clustering of the internet industry. It draws on in-depth interviews and field work in San Francisco Bay Area and New York City.