TVs may not track yet, but phones or PCs are already tracking the TV ads people are watching: "Beware of ads that use inaudible sound to link your phone, TV, t

TVs may not track yet, but phones or PCs are already tracking the TV ads people are watching: "Beware of ads that use inaudible sound to link your phone, TV, tablet, and PC. Privacy advocates warn feds about surreptitious cross-device tracking." http://arstechnica.com/tech-policy/2015/11/beware-of-ads-that-use-inaudible-sound-to-link-your-phone-tv-tablet-and-pc/ http://arstechnica.com/tech-policy/2015/11/beware-of-ads-tha...