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I haven't looked, but I would bet any money that Google does the exact same thing, too.

This seems like a gross privacy violation to not honor the logout button, and continue to track the account ID of the user. I would be very surprised if Google were doing this too. And I would be surprised if Facebook were not hauled into court over this (at least in the EU if not in the US).

Logout has never meant "stop using unique id cookie tracking". Ad networks have been using them forever even without login/logout functionality.

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