BUSINESS: MARKETING and ADVERTISING

List: Top Ten PPC Search Engine Advertisers in North America

Date: December 2008

Source: AdGooroo

Base: Estimated Ad Impressions within the month of December 2008

Notes: According to a fourth quarter report from search marketing firm AdGooroo, the advertiser that served the most ad impressions against Yahoo search results in December was Business.com, a site that makes most of its money by serving Google AdSense ads on its directory verticals. This arbitrage excercise implies Business.com makes more money sharing ad revenues with Google on Yahoo's traffic than the amount it's paying for Yahoo ads. Business.com appears in Google's top 25, too, but only at number 11.