Yes, because now they are allowing a third party to track you. You may be fine with it, but most users are not aware that FB is tracking them everywhere AND tha

Yes, because now they are allowing a third party to track you. You may be fine with it, but most users are not aware that FB is tracking them everywhere AND that their credentials are being handed off across a third party. Never, ever do this. We rail about banks and credit firms handing off our data but are apparently perfectly fine with handing off our users data without their knowledge to a firm with known privacy issues.