I recommend avoiding these offers and give it a 10% useful rank. Some 58% of those users scanned a QR or bar code from their home, while 39% scanned from retail stores; 53% of the 14 million users were men between the ages of 18 and 34, then women seem to be passing men in the QR codes scanning studies recently. Also I'd like to note that by Amazon items, I mean ANY item that Amazon sells. We've all seen QR codes, even if we don't know what they are or what they do. 100% useful (but only qualify about 60%
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