Don’t trust your beloved smartphone, because there’s a chance he could be cheating on your with your friendly neighborhood pizza joint. A feature in the Wall Street Journal examines a slightly alarming new marketing trend: businesses are using sensors placed discreetly around the city to track their customers’ daily habits and interests. The sensors can track the movements of any passersby carrying WiFi-enabled smartphones. That means Turnstyle’s clients—like the Asian restaurant profiled in the article—can see when their customers are hitting up Starbucks, shopping for clothes, or partying it up in da club.
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