The Japanese testing of AdWords on mobiles proved successful enough that Google has quietly debuted the service in the US. Do a mobile search using Google and something completely unexpected may appear.

Google has now brought AdWords to mobiles, a move that increases the number of potential outlets for their advertising inventory.

Cellphones have become so mainstream that it is more unusual to find someone without one these days. Since they generally stay within arm’s reach of their owners, mobiles are a highly desirable place to deliver advertising

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