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Facial recognition: How a silly app uses incredibly powerful technology

Snapchat is a silly thing. 13- to 18-year-olds use it to send goofy photos and videos to each other. Brands use it to sell their products to those same 13- to 18-year-olds. Regardless of whether you're a brand, part of the audience, or something else entirely, there’s no denying that some pretty powerful technology is…