Facebook and Twitter are far from passé, but food retailers are testing less-established social networking platforms like Foursquare, Groupon — even QR Codes — for promotional purposes. PCC Natural Markets, Seattle, is so technologically advanced that it will soon start connecting with shoppers via Quick Response (QR) codes, barcodes that smart phones can read to display text, a Web page or video. The QR code got its start in the Japanese auto industry for ...

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