That's creepy. Different topic: I think the biggest connection business is whatsapp. If a person does not use whatsapp but a friend of that person does, whatsapp knows the person's phone number anyway. If >= 2 whatsapp users have that person's phone number stored with the same name in the contact list, whatsapp even knows the person's name (and other information). With that information they can accurately identify the person's facebook profile. Horror!