&gt;&gt; build a feed with notifications for HN users, which will notify about the following items:<p>&gt;&gt; - When a user you follow comments on Hacker News (e.g. ptacek, patio11, dang)<p>Reddit has something like this but they didn&#x27;t invest in it at all, and even with that it&#x27;s a terrific source of content for if you as a user invest the effort in collecting friends.<p>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&#x2F;magazines&#x2F;feeds on many varied subjects, by experts, with great content quality, far above the bullshit of ad-driven media.<p>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&#x27;s an API, there&#x27;s already a notification built into reddit(which increases virality).