I built this tool to help me find original contents on HN. It is impossible to go through all posted contents everyday and I'm not interested in all the news content. So this tool try its best to filter out 'non-original contents', here is the rules that it uses to filter out content:

A user is flagged if :
The idea behind all that is to reduce enough the number of links posted per day, so it is ok to go through the list of all links left everyday. And also by giving the maximum chance to 'non-professional' posters