Earlier quoted context omitted.
I have done several experiments in Reddit. I post a link with a plausible title and credible looking 404 to credible domain with made up url. In a big subreddit you easily get 30 top level comments before first comment says that link does not work or is fake. Discussion goes on and on without pause. People treat the title as a writing prompt. One of the best writing prompts is pseudo-philosophical techno-bro life or…
I feel like a closer approximation of what’s going on is that there are perennial discussion topics that people want to participate in when they see an opportunity (e.g. “battery technology continues to improve, but it’s rare that we see the results trickling down to consumer electronics.”) But just having a forum with “evergreen threads” where people talk continuously about perennial topics, doesn’t seem to work out…
Many people seem to mistake the social purpose of these “post a link and comment on it” sites as actually being purely for discussing the content of the link. It’s possible to use such sites this way, but it’s not incentivized by the UX compared to the alternative discussed above. You usually need stringent community moderation if you want people to focus on the news itself.
A free UX design idea: if you want to build “a discussion forum for news topics in a domain”, then rather than endlessly cloning the Reddit/HN model, try building a hybrid of Reddit with a traditional discussion forum. I.e.,
1. start with a traditional discussion forum (thread-list view with threads sorted by last-posted time);
2. make it so threads aren't “bumped” to the top from regular posts in those threads;
3. add a special “news link” type of post, that users can make, which does bump the thread.
(Bonus ideas: scrape the news-links and so render the news-link's content inline in the thread. Have automatic "threadmark" navigation between the spans of posts delimited by these news-item posts. Make clicking the thread in the thread-list view navigate to the newest news-item post. Require moderators to approve news-items before the bump triggers, to avoid "redundant" bumps, to in turn increase users' faith in bumps translating to a real renewal of discussion.)
I imagine such a UX would work much better as a way to explicitly run continuous long-running discussions of news topics, as refueled by news links. One core benefit is that what would on Reddit be “previous threads” would on this forum be “the same thread”, and so people would (hopefully!) feel much less of a reason to recapitulate the exact same posts.