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Mozilla launches Facebook Pixel Hunt

“In a collaboration between journalists at The Markup and Mozilla researchers, this study seeks to map Facebook’s pixel tracking network and understand the kinds of information it collects on sites across the web. The Markup will use the data collected in this study to create investigative journalism around the kinds of information Facebook collects about you, and where. The study will run until July 13, 2022. Goals of the Study – 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. This Study Will Collect:

  • The data sent to Facebook pixels as you browse
  • The URLs of the web pages you browse
  • The time you spend browsing pages
  • The presence of Facebook login cookies in your browser
  • A study survey that the user completes
  • Metadata on the URLs your visit:
  • The full URL of each webpage that you are on
  • Time spent browsing and playing media on each webpage
  • How far down the webpage you scrolled


In addition, your Rally demographics survey responses will be combined with study data for the analysis…”

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