Not to spy but to discover patterns if any. Each time a HN-user votes for an article he is expressing his/her opinion in a subtle way. E.g "Yes I agree with this comment". After reading PG's comment on the 'Are you capable of being ruthless to get ahead?' article I Up-voted it. This says also something about me, in this case probably of my morality. Would it be possible to devise some kind of 'profile' of my voting behaviour. Not to filter stuff but just as a kind of peripheral awareness.