# ActivityPub between two Discourse instances
**URL:** https://meta.discourse.org/t/activitypub-between-two-discourse-instances/324374
**Category:** Support
**Tags:** activitypub
**Created:** [September 1, 2024, 10:31am UTC](https://meta.discourse.org/t/activitypub-between-two-discourse-instances/324374 "2024-09-01T10:31:07Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Matthias\_Schuster](https://meta.discourse.org/u/Matthias_Schuster)
#### Post date: [September 1, 2024, 10:31am UTC](https://meta.discourse.org/t/activitypub-between-two-discourse-instances/324374/1 "2024-09-01T10:31:08Z")
To which extend can two instances of Discourse communicate with each other through the API of ActivityPub?
---
### Author:  [@nathank](https://meta.discourse.org/u/nathank)
#### Post date: [September 4, 2024, 10:51am UTC](https://meta.discourse.org/t/activitypub-between-two-discourse-instances/324374/2 "2024-09-04T10:51:23Z")
Do you mean directly using the [ActivityPub Plugin](https://meta.discourse.org/t/activitypub-plugin/266794)? If so, this is what you can currently federate:
### Can be federated between Discourse instances
1. _Public_ topics can be federated when
- created in a specified Category or created with a specified tag
2. Replies on those topics can also be federated _in both directions_
- this is super cool, but only works if both instances are public
3. Deletions of these will also be federated
### What _can’t_ currently be federated between instances:
1. edits aren’t federated
- this includes wiki edits
2. old topics / replies can’t be federated
- this can be quite a challenge for legacy content
We are currently exploring federation between the #pavilion tag here on [meta.discourse.org](http://meta.discourse.org) and [coop.pavilion.tech](https://coop.pavilion.tech), so hopefully you’ll be able to see this in action in a real world setting shortly.
---
### Author:  [@Matthias\_Schuster](https://meta.discourse.org/u/Matthias_Schuster)
#### Post date: [September 15, 2024, 6:09pm UTC](https://meta.discourse.org/t/activitypub-between-two-discourse-instances/324374/3 "2024-09-15T18:09:28Z")
In case I federate based on categories, do I go right in the assumption, that they would simply show up in each others category list?
So are those categories listed as if they were native, non-federated categories?
---
### Author:  [@nathank](https://meta.discourse.org/u/nathank)
#### Post date: [September 16, 2024, 7:07am UTC](https://meta.discourse.org/t/activitypub-between-two-discourse-instances/324374/4 "2024-09-16T07:07:32Z")
New topics in the source show up in the follower’s designated category, and replies are shared in both directions.
New Topics posted in the follower aren’t federated at present.
---
### Author:  [@system](https://meta.discourse.org/u/system)
#### Post date: [October 16, 2024, 7:07am UTC](https://meta.discourse.org/t/activitypub-between-two-discourse-instances/324374/5 "2024-10-16T07:07:56Z")
This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.