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QR codes are becoming a regular sight.
But they are far from being useful for one simple reason: a total lack of common sense.

1) no one is going to scan a food item with one
2) they are useless when used where you don't have wifi/3G/LTE
3) they're dangerous on billboards
4) they're un-scannable on subway posters -- where subways don't have centre platforms [like in more than half of the TTC system in Toronto]