If you cannot entertain the possibility that employees of the company who work with the code in question are telling the truth, and put more faith in a paraphra

If you cannot entertain the possibility that employees of the company who work with the code in question are telling the truth, and put more faith in a paraphrase by a journalist, then we don't have much common ground to have an intelligent and respectful discussion. Many large web services, for instance Google's Plus button, appear to work in exactly the same way with logged-out cookies. This is something you can easily test yourself. When asked, these companies make exactly the same statements about how this data is and is not used. All of the speculations in your last paragraph would seem to apply equally, though I personally don't put much credence in them. So the question is unfortunately not one of facts, but of trust and feelings. Beyond telling the truth as far as I know it there's not much else I can do. FWIW we don't make evil plans down in the old volcano lair.