It’s annoying seeing the same headlines numerous times linking to same stuff because it’s cross posted to 3+ instances.
Is there a setting to reduce that or app that handles that well?
The default webUI de-duplicates cross-posts. I don’t know if any apps do.
They have to be actual cross posts though, don’t they? Would that catch the same link spammed across multiple instances and communities?
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)
There are no “actual” cross posts. Cross-posts on Lemmy are just all posts that have the exact same URL in the URL field.