I thought it would be good if making a post with a URL alerted me if the same URL has already been posted to another community/ server. Then it could offer to make the body of my post a comment under that post instead.
What do you think, and do any technical people familiar with Lemmy / Piefed / ActivityPub know if suc h a feature is possible without huge overheads?
I have an open issue in their git for link detection before posting. Hopefully it is coming soon.
One of the Mlem devs said the detail is done by Lemmy, the app just displays it.