Here in Brazil there are websites which will give you info (address, telephone, mother's name, even salary) on basically anyone. They take it from CADSUS, i.e.

Here in Brazil there are websites which will give you info (address, telephone, mother's name, even salary) on basically anyone. They take it from CADSUS, i.e. the SUS (publich health system) registration system, which is available for every public hospital to do queries, but those hospitals receive a default and very common username/password combination which they usually don't change. They also take info from credit protection agencies such as Exparin (presumably some employers sell access passwords). It's completely nuts. I always give fake or incomplete information to everyone, private or public (and you must give info for practically anything here). If it's absolutely necessary to give real info, then I never update it.