This thread seems to lack a very common issue that I've seen in almost any of the threads I've made recently.
Low Quality/Useless Post - A post that in no way what so ever contributes to the thread.
An actual example that was reported. In response to the thread "Hitsugi no Chaika : Sell it to me"
It's easy to understand how the a reply like this doesn't add anything, serve and purpose and if the individual didn't want to answer the question you could even do that through the thread.
It would have been simple enough to say something like "blah blah blah I think you should go through and watch it not because of anything particular but just because at least in my opinion I felt it was blah blah blah and you should just give it a shot"
It exists and needs to be addressed for instance if you ask a question that requires some sort of explanation and the reply is simple "nope" or "lol" theses are obviously to the extreme but the idea remains regardless. I've reported and will continue to report low quality posts or posts that in no way contribute the thread because they begin to devalue the thread completely.
Start off a thread and then the first post is something that is clearly useless or something that holds no value and it's more likely to snowball into that.
On terms of what @Wexter was speaking off about moderation and how it should be organized within the community (or at least that's what I picked up). No matter what you do there is always a grey zone. A good example is "No impersonation/claiming to be a moderator" simple enough.
However an individual could come and make an account that looks exactly like a moderation/admin or whatever. While it's they aren't impersonating or claiming to be a moderator since "No one asked I never said I was a moderator or pretended to be one" they still leave the impression of being a moderator. A bit of logic is required and people have to remember that rules are guidelines for regulation they aren't end all be all. Just because you found a way to get around something does not mean that you are no longer guilty of breaking the rule.
The community is naturally not responsible for moderation that's the moderators job however the community is without a doubt important to moderation simply because moderators are human as well. They can't see every post and check every thread. Reporting things helps bring it to the attention of a moderation which is why it's absolutely important for the community to be able to report things. With that said that's where the communities job ends (for the most part) from there on out it's up to the moderator to handle the situation. In some cases where people have asked something that has maybe been asked a thousand times over again the community can without a doubt let the individual know and link other threads that are the same and let them be aware a search function exists then follow that up with an actual report and drop it there.
If you want a global solution in fixing and cleaning up the forums then I'd recommend revamping (not redoing there is a difference) basically everything. For starters banning people from the forums will have to become a more active thing. As far as I've heard I hear it's a rare occurrence? There should be three types of bans in order to keep the community function.
Forum Ban : The individual can no longer access the forums. They can't read or reply to anything.
Feed Ban : The individual can no longer post on their feed. They can view other peoples feed but can't post anything or reply to feeds.
Global Ban : The individual can no longer post or see feeds, forums or anything else that interacts with the community. They are still able to use their list but have no connection with the community in anyway.
Now that you've established base lines for punishments you have to decide what is punishable.
Spam , NSFW/GORE , Flamming , Posting Personal Information , Spamming/Flooding , Impersonation of a Moderation
however you can't ban someone for life just because they told someone to fuck off. So from there you have to create a strike system or more widely know on primarily forum based websites. Infractions. Different forums do it different ways but the general idea is it's a tally/point system that managed the members history of rule breaking.
Each rule is worth a certain amount of points and when they hit so many they are banned. Some things may be worse then anothers. For instance giving out someones personal information will probably be worse then telling someone to fuck off. On top of having a general point system you have to also include warnings. Did this user just get pissed one and that's that? Alright then tag him with a warning and tell him not to do it again. However not everything warrants a warning. Spamming? In what way is spamming ever justified? Posting person information? Let's figure some more details out on it.
Most forums use an infraction system of some sort. When a individual violates a rule they are giving access to a thread that no one but other mods/admins can see that would function as a notification/debate of the infraction/warning.
User : Heavenly
Offense : Flamming
Proof : (screen shot)
and from there the individual can attempt to justify his actions or let the moderator know more about the situation.
I can say at least from someone who has been on forums both as a user, moderation and admin for nearly 9-10 years now. A lack of established system usually causes issues in the community. Obviously known trolls roll free, people attack one another or threads are given no respect for their topic and throw all over the place.
Hummingbird forums are just that forums. They are a social media site or youtube comment sections. If you want a properly functioning forum which people don't mind going and checking out. You have to promote healthy content and punish people who aren't good to the community.
Also most forums have a reputation system. So you can see how the community feels about an individual and it serves as an appreciation factor or goal for people who post content. Reputation lets them know that people not only like what they're posting but are also appreciative of it.
tl;dr it's not an easy problem, look at how actual primary forum-based websites are run for an idea on how to properly manage forums and read my wall of text.