[amutap]

The thing that you are talking about is already in place in a very famous social bookmarking site - stumbleupon.com. It works on exact same principal - "Personally, I want to find comments by people I've come to trust, without necessarily agreeing with. My assessment won't necessarily agree with yours, so we end up with a system that has to record individual preferences."

It categorizes all the links marked and over a period of time it will show your surfing preferences. Every user has a profile and you can visit their profiles and view their preferences and subscribe to their 'stumbles' - links they liked.

The thing that's missing on stumbleupon is the discussion culture that present on HN.