#Trackers are hiding in nearly every corner of today’s Internet, which is to say nearly every corner of modern life. The average web page shares data with dozens of #third-parties. The average #mobile app does the same, and many apps collect highly sensitive #information like #location and call records even when they’re not in use. #Tracking also reaches into the physical world. Shopping centers use automatic license-plate readers to track traffic through their parking lots, then share that data with law enforcement. Businesses, concert organizers, and political campaigns use Bluetooth and WiFi beacons to perform passive monitoring of people in their area. Retail stores use face recognition to #identify customers, screen for theft, and deliver targeted ads.

https://www.eff.org/wp/behind-the-one-way-mirror

Behind the One-Way Mirror: A Deep Dive Into the Technology of Corporate Surveillance

It's time to shed light on the technical methods and business practices behind third-party tracking. For journalists, policy makers, and concerned consumers, this paper will demystify the fundamentals of third-party tracking, explain the scope of the…

^{Electronic Frontier Foundation}