comScore has released its internet traffic statistics for September 2009.
According to comScores’s Top 50 Ad Focus Ranking:
AOL Advertising led the September Ad Focus ranking reaching 91 percent of Americans online. Yahoo! Network ranked second, reaching 89 percent of the population, followed by Google Ad Network with an 86-percent reach.
The Ad Focus Rankings measure an ad networks reach ie., the percentage of the internet audience exposed to its content and advertiser’s messages.
Ad networks are advertising platforms where advertisers can buy an aggregated internet audience through a single ad distributors interface that reaches the ad network’s advertising partners like content network purchases made through Google Adwords.

Top 50 Ad Focus Rankings
Tags: Top 50 Ad Networks
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