QR Codes Are Here to Stay. So Is the Tracking They Allow.

SAN FRANCISCO — When people enter Teeth, a bar in San Francisco’s Mission neighborhood, the bouncer gives them options. They can order food and drinks at the bar, he says, or they can order via a QR code. Each table at Teeth has a card emblazoned with the code, a pixelated black-and-white square. Customers simply …

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