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Good question and I'm not sure. I would guess that if it doesn't accept them then it wouldn't read them either. The first step in the cookie transaction would be to check whether that cookie already exists (an attempt to read the cookie). It would seem easiest to stop that process at that point based on user preferences rather that just programming it to check at the actual write time.

This is all speculation though.




But once you sign in to Facebook, you have the cookie, so browser will send it if there's no read blocking.




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