It’s happening everywhere, but it’s easy to notice on Reddit as the impartiality of the moderators seems to be getting weaker and the thresholds for considering something ‘news’ appears to be bottoming out — at least on the subreddits I visit.
The language used in headlines on /r/politics, for example, is incredibly biased with language like ‘slams,’ ‘hit piece,’ ‘peddles,’ and so on. And that’s saying nothing of the pieces that aren’t strictly news. For example, those speculating, those that lead to a two-paragraph story without sources, background or puff pieces, and so on.
Since Reddit doesn’t allow filtering by anything but ‘flair’ but does allow subreddits to be created and posted to by an API, it might not be too hard to create a private duplicate of a subreddit and automatically repost submissions that garner a certain number of upvotes that don’t have our filtered keywords in (or apply flair to them and have Reddit automatically filter them for us).