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Ultrasonic Tracking: Are our phones really listening to us?
Twenty Thousand Hertz
The Ultrasonic Beacon at Macy's
Macy's department store uses an app called Shopkick to track shoppers. The app lets you earn points and gift cards for walking into stores like Lord & Taylor, Yankee Candle, and American Eagle. Yale Privacy Lab found that over 75% of Android apps have some kind of tracker.
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