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If you ever find this site, let me know. HN is this closest site to what you're looking for that I can think of. We could possibly improve on this by adding sub

• rpm4321 14y ago
  Maybe not subsections, but allow users to create and up-vote tags on stories, or maybe have a simple dropdown on story submission with a dozen or so tags the submitter could apply. That way you could still narrow your focus when you don't want to miss certain content (ex. #Python, #AI, #Business, etc. at news.ycombinator.com/tagged/Python, etc.), but you wouldn't disrupt the current community feel of HN too much.