New facial-recognition marketing efforts are cropping up. What might make for a good plot twist in a Sci-fi novel is actually detailed in The Wall Street Journal. Dunkin' Donuts is among the first marketers in the U.S. to begin testing the technologies, at two locations in Buffalo, N.Y. People ordering a coffee in the morning can see ads at the cash register promoting the chain's hash browns or breakfast sandwiches. …
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