Facebook is now free to track users’ internet activity regardless of whether they are signed into the social network after a Brussels appeals court dismissed an earlier ruling banning the practice.
The Belgian Commission for the Protection of Privacy implemented a rule forbidding Facebook from tracking users’ behavior — such as engagement, likes, and shares — via cookies in browser plugins that collect data even if the user isn’t logged in. Facebook faced a €250,000 (now approximately $277,500) daily penalty for continuing the practice.
— source thinkprogress.org