| Billboards are using sensors to identify, target and track individuals | 33 | 1688 | December 2, 2018 | 
          
            | Wouldn't it be great if a billboard could actually read your mind? | 40 | 3539 | October 29, 2014 | 
          
            | The London Underground thinks it can sell travelers' attention and wifi data for £322m | 15 | 1678 | October 7, 2017 | 
          
            | Fake, phone-attacking cell-towers are all across America | 46 | 4954 | September 7, 2014 | 
          
            | ACLU challenges legality of NSA's spying program--and here's what your phone metadata reveals | 36 | 3984 | September 1, 2013 |