QR codes, or “quick response” codes, were invented more than 15 years ago in Japan as a way to track automobile parts in production. But as soon as marketers got wind of the technology and smartphones came on the scene, the codes, which can reveal text messages, videos, Web pages and even dial a phone number for you, started being used in myriad ways. As QR codes become more and more popular, they’ve been popping up in the most creative places.
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