Silverpush says it's not in the ultrasonic audio-tracker ad-beacons business anymore
by Cory Doctorow from on (#17WQ6)
Silverpush, the company that pioneered covert ultrasonic audio beacons that let advertisers link your activity on phones, tablets and laptops, says it will no longer sell the technology and does not want to be associated with the idea any longer. (more")