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A comment on Silicon Valley Is Not Your Friend. Parent comment

Re:Silicon Valley Is Not Your Friend by darethas on Friday October 13, 2017 @11:49AM (#15466684)
Right, but do you hang out with people around you that tweet, Instagram, and post on Facebook? Have you ever had dinner with friends and they have an Echo/Dot/Home/"Smart" TV? They can infer where you are based on being around others that use these services.
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Re:Silicon Valley Is Not Your Friend by bogomipz on Friday October 13, 2017 @12:34PM (#15467152)
I understand about being tagged in a photo and a social media site inferring where I am but can you explain how this happens with a friend's "Echo/Dot/Home/"Smart" TV"?
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Re:Silicon Valley Is Not Your Friend by gm-conspiracy on Friday October 13, 2017 @12:46PM (#15467273)
Ultrasonic? GPS? geolocation using WAN IP of those devices and your device's GPS coordinates. You are in the same vicinity.
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