Google has expanded its mobile advertising line-up with the launch of Adsense for Mobiles,
which will contextually target advertising onto mobile site content.

According to the search giant, the ads will provide a new source of revenue for mobile publishers, as well as giving an incentive for exisiting websites to produce mobile versions.  

Google’s Dilip Venkatachari told the New York Times that it would encourage mobile publishers to limit the number of ads to two per page, to avoid spoiling the user experience.

As with standard Adsense/Adwords ads, Adsense Mobile text ads will run on an auction model. The service will be available for publishers in the US, England, France, Italy, Germany, Spain, Ireland, Russia, Netherlands, Australia, India, China and Japan.

Google’s entry into the mobile ad market has been expected for some time – AdMob, which runs a similar system to Adsense, has been pretty successful so far, serving a billion mobile ads in its first year.

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