You see a QR code posted somewhere - like, say, a store window - and hit it with your mobile, and voila! You've 'liked' something, or maybe given the business access to your Facebook data. Wait... what? Remember - QR codes are (sometimes) just links, except that you can't see what you're linking to (and consequently, can't see what you're agreeing to). Here's a better plan: put human-readable URLs in your window, and create a URL-reading application for mobile phones. So there won't be a spate of QR-surprises.
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