Reddit is truly amazing, such that I've mostly replaced my usage of hackernews with it. I have serious issues with anxiety, and the inability for me to filter out content related to "current news" aka "clickbait fear mongering" means when I surf hackernews for too long I'll be upset for hours afterwards as I'm riled up with current events rewritten as FUD. Reddit can be filtered by subreddit, so I've got a view with…
Take /r/ukpolitics for example, back in the day an anarcho-syndicalist could have a debate with a die-hard Thatcherite and while it'd be fairly heated, people tended to know their shit and I'd generally come away feeling like I learned something after reading the board for an hour or so. After 2015 (and even more so after the EU referendum) the subscriber count exploded and now it's a complete echo chamber. Try making an argument that the EU isn't some sort of Star Trekkian utopia or that Scottish independence might cause a lot of economic problems on that board and you'll get downvoted out of sight within maybe half an hour. It's very, very black and white now, the board is so fast that it's all about quick, karma-farming content rather than actual political debate.
I don't know why this seems to be a problem unique to Reddit. HN doesn't seem to have the same issue (at least not to the point it dominates the character of the platform), despite it being essentially a clone of old-school Reddit. It's a problem I'd be interested in knowing more about because I'm working on a platform with user-generated content. It's currently using a very naive "rank by votes, exclude old or heavily downvoted posts" approach but I fear this approach could lead to the same problem as Reddit.