How does one block third party websites from accessing my facebook?

Several third party websites have access to my facebook allowing me to make comments on their page through facebook or logging me in automatically.

In facebook privacy in the apps and websites section I have selected: “You have turned off all platform apps, games and websites.” but that doesn’t seem to do anything. I’ve scoured the privacy pages and can’t seem to find any other options to stop this.

Help, I don’t want third party websites to have access to my facebook.

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