Many apps are actively listening for ultrasonic beacons embedded in many a TV & radio broadcast. Technically, they aren't recording your speech, but are still l

Many apps are actively listening for ultrasonic beacons embedded in many a TV & radio broadcast. Technically, they aren't recording your speech, but are still listening all the time, finger printing your media consumption. This information is from a friend, an ad industry insider. Next time you grant an app a "record audio" permission on Android, think twice