I just upvote the one on beehaw.
Ideal scenario would be posts made to communities on smaller instances dedicated to what that post is about (so a tech instance, programming instance etc).
The issue arises from larger general purpose instances existing, and posters not understanding how the fediverse works. Or maybe wanting to game their reach/exposure
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Yeah, that would be ideal. But you're right, it's usually on general purpose instances for broad topics like News.
It does feel like an opportunity for karma / reputation farming though, through mirror communities.. I was wondering what you could do to prevent that, like only allowing users to create posts on their own instances and stick to commenting on others, but anything like that would probably be over-reach and go against the principles of the fediverse.
Are they cross posts? Or just duplicates?
Bit of both it seems. There's one or two users who seem to do this consistently. It's fine in principle, but when communities are still small, cross-posting ends up taking up proportionally more space.
Does Lemmy support crossposting like Reddit did?
Yep, the double square icon button.