Privacy, I don't need no stinking privacy

[michelangelo]

I would agree with arz and wolud even go further: since one can never be sure that what you are told a someone else (person or agancy) is true, you never really know howmuch others know aobut you and if, how and when they will use it.
Since history has learned us that goverment agencis are corrupt and corruptable, we should be really careful here.
And let us consider an even more worrying alternative: what if the tevhnology involved would be in the hands of your worst enemy? You would not have any freedom left and problable no life either!! Worrying thought.