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RE: Facebook has a file on you: Even if you don’t have an account, if you’re online, they track you through third-party activity
They absolutely do. What you should do is install a good adblocker like uBlock Origin. Then go to the logs and manually block any and all calls to fb.com or facebook.com or other domains that are related to facebook.
It's a pain to do it at first but it's so worth doing it once and for all.