Some 13.5 million smart TVs in the United States are quietly piping data to advertisers about what you're watching, whether it's Game of Thrones or the Republican presidential debate or a rival company's commercial, The New York Times reports. While the opt-in page for Samba TV — which has deals with smart TVs made by Sony, Sharp, and Philips, among others — says it will "cleverly" recognize onscreen content and recommend shows and special offers, it does not explain the extent to which it is tracking your TV's every move.