[p-e-w]

Interested in one common topic. If I like crocheting, interacting with people in a crocheting subreddit doesn't create a "filter bubble". The people in that sub are still going to have wildly different opinions and preferences from myself on any topic besides crocheting. And large subs like AskReddit are obviously being frequented by people from every imaginable background.

[OfSanguineFire]

A forum on a single common topic can still create a filter bubble. For example, I know some music and outdoor-sports forums where the participants now post about not only those topics, but also a limited spectrum of US political rants or social-justice advocacy. If you come from somewhere else and you have different views or do not participate in such discussions, you can feel outright excluded from the club.

On any anglophone forum, it can happen that just enough participants are North Americans with the same views, that their political and social concerns are considered relevant and important. Some Reddit subs have seen this, too. Obviously a moderation rule of “no politics” or “no off-topic” would help, but sometimes even the moderators are passionate about those same political or social concerns, and believe that preventing discussion of such would be fascist.

[account42]

> Obviously a moderation rule of “no politics” or “no off-topic” would help, but sometimes even the moderators are passionate about those same political or social concerns, and believe that preventing discussion of such would be fascist.

Worse, as long as the the mods have free reign to decide what is and isn't politics this is just yet another way of phrasing the real rule of "no things we don't approve of".