Of late, we have been seeing a growing nexus between the companies that offer “always-on” devices that listen for our voice commands, and advertisers or marketers that unknowingly follow us around the web to create personalized user profiles. The symbiotic relationship between the two is beneficial in some ways. The advertisers, for example, manage to get valuable information about our behavioral patterns and the device manufacturers in return get a share from the revenue generated in the process. But all this is done at the cost of your privacy! Ultrasonic Cross-Device Tracking Now a new technique has been developed

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