The default webUI de-duplicates cross-posts. I don't know if any apps do.
this post was submitted on 14 May 2024
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They have to be actual cross posts though, don't they? Would that catch the same link spammed across multiple instances and communities?
There are no "actual" cross posts. Cross-posts on Lemmy are just all posts that have the exact same URL in the URL field.
So if I post a URL to one community and post a URL of that post in another what's that?
Not a cross post. It just creates a post that links to the first post.
If you made a third post that also linked to the first post using the same url as the second post, that would be detected and get linked up as a cross-post to the second post.
Actual cross-posts work in both directions. Lemmy detects them as the same thing, both posts link to the other.
Not in the post body, the post body quote and "cross-posted from" text is completely meaningless and just gets added by most clients, adding it doesn't make something a cross-post, and removing it doesn't break the actual cross-post feature, which shows up as a little "cross-posted to: list of communities" thing on the post page.
Thunder has it, Photon does it, and the default webUI does it.
So does that mean shared comments? Or are they separate? And yeah I'm on eternity hangover from the Reddit days.
No, the posts are separate. But each post will list every other post so you can visit the other comment sections.
Yeah - I think anything the UI is doing, it's getting the info from the API, so the poster would've had to use the 'cross-post' feature. There are some apps (e.g. Voyager) that try to wrangle cross-posts by title or URL, but title-matching can give false postives, and URL-matching usually assumes that one link hasn't picked up some cruft, and it can't do much for uploaded images if the poster didn't cross-post (because it'll be 2 different files with different URLs)
Different people posting the same URL get their posts linked up as cross posts.
The cross post button just copies the post text into a new post. It doesn't do anything special.
Oh, right. Sorry. I've gone back and checked the post I was thinking of when I made that comment, and - yeah - it turns out I was misremembering / didn't properly investigate the first time.
News to me! Good to know. Will have to see how thatβs handled and maybe make pr to my favorite apps
If you find any with it let me know. Not hopeful for Sync.
There ought to be a way to tag a single post for multiple communities
I just block the users who do it. Requires a few seconds and then I don't worry about it again.