There is an automated text classifier behind it and I'm continuously training it for hacker stories. The classifier and my definition of what are hacker stories are, of course, imperfect, so there will be errors (I'm training the filter with some delay, usually once per day). If you want to filter your own feeds like this please ask me for an account.
I am experimenting with something that may help. Here is a URL to the RSS feed of Hacker News, filtered to contain only hacker stories:
http://www.lemmatica.com/emit_topic?key=aglsZW1tYXRpY2FyDQsS...
There is an automated text classifier behind it and I'm continuously training it for hacker stories. The classifier and my definition of what are hacker stories are, of course, imperfect, so there will be errors (I'm training the filter with some delay, usually once per day). If you want to filter your own feeds like this please ask me for an account.