It would be cool if crossposted posts would have like a common comment thread or something like this: a crosspost does not copy the post to another community, it creates a "softlink" to the original post. This way, everything done to any of the crossposted post (vote, comment, mark as viewed) would be also applied to other crossposted posts. This way, we would only see a single post instead of 15 posts, and we wouldn't miss any comment from any of the communities it is crossposted. Obviously, users may wish to just copy the post to another community. What do you think about this? Should we open an issue on github about this?

Its not ontly that, on my lemmy server there are multiple people who really take that BuT LeMMy iS a NeWs aGgReGatOr to the next fucking level, to the point that i recognise 4 users who spam teh same article over multiple subs in almost choir unisons. Noone from them is a bot account, they really think they are doing a good service.

Carefully curating a subscription list and sticking to the subscriptions filter has worked well for me.

I'd be happy if we could just cease having the exact same post show up 2 to 5 times in a single community. I'm seeing the same article linking to the same URL showing up in news, for example, today, 2 days ago, 4 days ago, and 6 days ago.

As far as seeing the dupe across different communities, if you are subscribed to the same community on different instances, then I'd recommend picking one and unsubscribing from the rest. The only way a single community can become the most popular across all the instances is if people leave those other communities and settle on a champion.

What are you using to browse? The default webUI de-duplicates cross-posts, most apps do not yet.

This is something that ye olde Usenet got right, by the way. Newsreader software keeps track of which messages you've already read, and by default only displays unread messages. That's slightly easier to do on a system like Usenet (or Twitter) that doesn't make the distinction between "posts" and "comments" that Lemmy (and Reddit, Facebook, etc.) all do.

I would just block the posting bots, but sometimes those posts get a conversation, so I would miss it.

I just browse by top over the last 12 hours, and that usually avoids it.

Honestly, I just make sure my default view is "Subscribed". I can go to 'All' if I need to, but it definitely helps.

(Mastodon also works best when limiting to local instance and follows - it would benefit from being able to aggregate a few select local instances in a view, but that's getting even further off topic!)

Sometimes the same post is posted two different places. I have seen it before.