It is possible for NodeBBs to talk with each other. In fact, not only can two NodeBB forums see and share conversations, you can also connect with other websites that can federate.
This article is part of the NodeBB Answers category, where you can learn more about setting up, maintaining, and using your NodeBB forum. [...]
How does it work?
Under the hood, NodeBB uses a protocol called ActivityPub to exchange messages and activities between different websites and apps. Each user, category, topic, and post is able to be retrieved via this protocol, and users can follow each other in order to start seeing updates from another website.
How do I find other users and categories?
You can search for them in the search bar and search pages. Users and categories are identified by their username or handle, which looks something like @handle@website.com.
For example, I (@julian) can be found by searching for @julian@community.nodebb.org, and this category (@answers) can be found by searching for @answers@community.nodebb.org.
From there, you can follow users (or watch/track categories) to start the flow of new content to you. It's like subscribing to a newsletter. You'll start getting the new stuff, but you won't be able to see the old stuff unless you already know about it.
Okay, I started following some people, where do I see their posts?
Content from outside of the forum is all found inside the "World" page, accessible via /world. As new content comes in, it'll be shown in the feed-style timeline. Any remote categories you've started following will also show up in the sidebar for easy access.
How do I post to remote categories?
Once you've found some categories from outside of the forum (aka "remote categories"), you can browse back to them from the /world page. If you've watched/tracked the category, you can access them from the sidebar. Otherwise you'll have to search for them from the remote category search bar within this page.
Once you're in a remote category, you can start a new topic via the "New Topic" button just like a regular category on your forum, and your topic will be sent to the remote category for syndication.
Remember to follow the rules of other communities, as they may not match rules on your forum.