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I use QR codes... all these people putting emails, address, phone number, even other details - it's a direct marketers dream.
Crawl the 'net, like local pages which almost all have them, read the image in with many various scripts, parse the info, and you have the peoples email, address, and so on.
Toss a flyer in the snail mail, and off you go... entire profile databases can be created, people put alllll types of info in them.
Why am I telling you this? So you can see the truth of what they're being used for and maybe you can jump in too, before it dies off.
..... However I also use them in a golf ebook with the address, phone, ect for each course in the area loaded in the qr code.
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