>> build a feed with notifications for HN users, which will notify about the following items: >> - When a user you follow comments on Hacker News (e.g. ptacek,

>> build a feed with notifications for HN users, which will notify about the following items: >> - When a user you follow comments on Hacker News (e.g. ptacek, patio11, dang) Reddit has something like this but they didn't invest in it at all, and even with that it's a terrific source of content for if you as a user invest the effort in collecting friends. If you could take this feature on reddit to the max(for example advanced filtering) and package it as sort of mini-magazines, it would enable users to build terrific resources/magazines/feeds on many varied subjects, by experts, with great content quality, far above the bullshit of ad-driven media. And why reddit and not HN: the best reason is the variety of experts, not availble in HN. Also you could filter by subreddit and other stuff, there's an API, there's already a notification built into reddit(which increases virality).