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You can order a customized "add to friends" T-shirt which will let someone scan your shirt and automatically add you on Facebook. You could also print QR codes on marketing materials like fliers or ads, on a coffee mug, etc. Basically, any time you want to make electronic information available to someone who isn't at their computer.
qr codes not just an android thing, i sent my brother a couple of codes and he scanned it with his iphone. Just to joke around with him i sent him this
ahh i see. So whats the biggest use of these QR codes?!