How to Stop Facebook From Spying on Your Internet Activity | PCMag

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Here are the steps to help protect your privacy on Facebook.  However, as a guest commenter pointed out:

“Selecting to turn off future off-facebook activity tracking doesn’t stop them from tracking you, as you can see when you tap on turn off, it tells you that facebook will continue to receive that information. However, once you turn it off you will no longer be able to see what facebook is tracking.”

Source: How to Stop Facebook From Spying on Your Internet Activity | PCMag