Most Web activities do not generate jobs and revenue at the rate of past technological breakthroughs. When Ford and General Motors were growing in the early part of the twentieth century, they created millions of jobs and helped build Detroit into a top-tier U.S. city. Today, Facebook creates a lot of voyeuristic pleasure, but the company doesn’t employ many people and hasn’t done much for Palo Alto; a lot of the “work” is performed more or less automatically by the software and the servers. You could say that the real work is done by its users, in their spare time and as a form of leisure. Web 2.0 is not filling government coffers or supporting many families, even though it’s been great for users, programmers, and some information technology specialists. Everyone on the Web has heard of Twitter, but as of Fall 2010, only about three hundred people work there.