[SuperChihuahua]

I'm running http://www.trejdify.com/ which is like HN but with business news only, and I have a modified spam-filter that sorts the articles automatically in the different categories. Maybe HN needs something similar?

[krapp]

How do you do the sorting?

I've thought about doing something similar with the metadata of posted urls but obviously that might be ridiculously easy to game.

[SuperChihuahua]

I use the same spam filter as in the book "Programming collective intelligence"