The online ad revenue dropped to about $20 billion in 2002. However, it bounced back the next year and has been growing since then. It is expected to exceed $80 billion this year, and reach $120 billion by 2011, according to MultiMedia Intelligence data.

In 2011, search will account for the biggest part of U.S. online ad revenue, with about a 40 percent share, while display ads, classified and rich media combined make up about 50 percent. E-mail and sponsorship will lose their shares, making them only niche among all online ad revenue in the country, according to the World Digital Media Trends 2008 report, released by SFN and the World Association of Newspapers.