"Since June, users have been able to see fediverse replies on their posts if they enabled #fediverse sharing in the app’s settings. Once enabled, the sharing option allows users to syndicate their posts across the wider social web and then see how people on other services have responded. Now users will be able to see the fediverse replies on other people’s posts, too. This immediately brings more content into #Threads, even without a sizable increase in Threads users."
https://techcrunch.com/2024/08/28/threads-deepens-its-ties-to-the-open-social-web-aka-the-fediverse/