Now Playing: 05-04-12 Marketplace

Unemployment fell slightly last month, but the numbers don't tell the whole story. Not counted: the number of people who have given up looking for work. The Labor Department's report also noted which job fields are hot, and not. Meanwhile, Wall Street is getting Facebook fever ahead of the company's highly anticipated IPO. The government has released new rules on fracking. And filmmaker Jessica Yu talks about her new documentary, which discusses the scarcity of water and how it could reshape economies.