Google has quietly been running geo-targeted contextual ads in RSS feeds for several months, but many advertisers, agencies, and analysts contacted by ClickZ were surprised to learn about the placements.

"I don't think most advertisers know it's going on," said Kevin Amos, director of product management at search marketing firm Impaqt. "There's a lot of confusion in contextual advertising in general, and adding in RSS feeds makes it more confusing."

AdWords documentation online doesn't specifically mention ads being distributed to feeds, other than a reference to ads showing up on content sites and "products."

Find out more about geotargeting in Adsense RSS feeds at http://www.clickz.com/news/article.php/3558661.