this would almost certainly require an extension, since you'd need some sort of persistent way to track "viewed" items. I don't think a userscript can do it.

Best bet will probably be Instance Assistant (!instance_assistant@lemmy.ca ), at some point in the future. Could always make a request directly, too since this would likely be a relatively popular feature.

it'd be nice if Lemmy had a wiki page for communities...

thank you, bot! Updated my post.

timely! Thanks for posting this here!