by: Hayley Tsukayama | The Washington Post

The Interactive Advertising Bureau released new figures Monday showing that advertising supported Internet companies contributed $530 billion to the economy in 2011 and are, in some way, responsible for 5.2 million U.S. jobs.

The IAB-commissioned report from Harvard Business School, which updated a similar 2009 report, found Internet-based companies in every congressional district in the United States. About 2 million people are directly employed by Internet ad-supported firms, the report said.