Mozilla is launching a study called Facebook Pixel Hunt. The goal is to track Facebook tracking around the web.
According to its own privacy policy, Facebook may collect information about you across the web even if you don’t have a Facebook account. One way Facebook performs this tracking is through a network of “pixels” that may be installed on many of the sites you visit. By joining this study, you will help Rally and The Markup investigate and report on where Facebook is tracking you and what kind of information they are collecting.
Check It Out: Mozilla ‘Pixel Hunt ‘Study Aims to Track Facebook Tracking You