AT&T AdWorks is testing mobile ad units that prompt consumers to check in to their Foursquare accounts. When users click on the ads, they are shown a map with the advertisers' nearby retail locations, along with click-to-call ads and Foursquare-hosted tips and information. The move is an attempt to capitalize on the "intersection of advertisers' interests in social, local and mobile," says AdWorks marketing executive Maria Mandel Dunsche.

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