Categories are fedi groups, just like Guppe groups or Lemmy communitues.

Any nodBB v4 site can feserate like this, but not all will. Feseration is optional (as it is in most common fedi web engines, you just don't hear about the sites that turn it off), and for those that do federate, not all categories will necessarily do so (you can disable it on a category-by-category basis).

[@testingasdfasdf@expressional.social](https://community.nodebb.org/user/testingasdfasdf%40expressional.social) Great question! I believe giving a Fedi address to a category isn’t natively supported in NodeBB yet, but it would be awesome if it were included in future updates or through a plugin.