We currently have a good connection between publications inside of a discourse category and the publication on the Fediverse, thanks to the great work of @angus with the ActivityPub Plugin Moreover, there is a already a good link between publication in the WordPress CMS and Discourse with the WP Discourse plugin from WP Discourse – WordPress plugin | WordPress.org
Still missing (or maybe I did not see this functionality yet?) is a connection between a publication appearing first on the Fediverse and a (possibly internal) Discourse category. This would be similar to the current functionality with custom incoming email addresses based on sub-addressing (RFC 5233 - Sieve Email Filtering: Subaddress Extension):
I heard (but I dont know) that https://nodebb.org/ already has support for “bi-directional” interaction between their forum instance and the Fediverse …