Clear Channel Outdoor Americas, which has tens of thousands of billboards across the United States, will announce on Monday that it has partnered with several companies, including AT&T, to track people’s travel patterns and behaviors through their mobile phones. http://www.nytimes.com/2016/02/29/business/media/see-that-billboard-it-may-see-you-too.html
Next thing you know they'll be encouraging the public to wear body cameras equipped to look both ways, you know the one's, like on mobile devices for selfies and such