QR codes are a type of bar code that are scanned by smart phones. Rather than the traditional multi-width bar lineup, though, they appear to be a square of multi-spaced pixels. It is likely that, even if you are not sure you know what a QR code is, you have...
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via SEO Blog http://www.k2seo.com/what-do-qr-codes-mean-to-your-ecommerce-site/
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