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What do the little scannable squares on posters mean?

I've seen a few posters with little scannable squares on them. Is that NFC in action?!

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blizzard7  Aug. 22, 2011 at 20:00

The scannable squares are actually "QR Codes", a bit like 2D barcodes. You can scan them in with your phones camera and an app like Google Goggles where it'll redirect you to a website or app etc.

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