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Probably need to be client side tbh but when someone mass posts the same article across multiple communities and instances I only see it once with a list of where its posted if you go into it.
Yeah, one post and links to the different comment sections below it
Or the comment sections could just be merged together in the client view. Each thread of comments would belong to one (and only one) instance, so it shouldn't be difficult to merge those lists together when presenting the aggregate view to the user.
This already happens in the webui with native crossposting
If they use the crosspost feature this should already happen. Of course no apps support that yet to my knowledge.
This is my #1 request as well. Not easy to implement I’m sure but would be a huge QoL upgrade.