How outdoor ad networks like Five Tier let clients plan and target billboard ads based on mobile phone data about passersby such as gender, age, race, and more (Thomas Germain/Consumer Reports)

Thomas Germain / Consumer Reports:
How outdoor ad networks like Five Tier let clients plan and target billboard ads based on mobile phone data about passersby such as gender, age, race, and more  —  How the most intrusive parts of the web are expanding into the real world, complete with data collection and targeted ads

via Techmeme