A quick note here to let you all know that we have disabled the ActivityPub plugin here on meta. The plugin was a remains in maintenance mode, we will still support it with security, performance and bug fixes. On that note, we have merged several security fixes today in the plugin repo, we recommend any users of the plugin to update to latest.
On meta, unfortunately, the ActivityPub-enabled categories were only used by a few users and we had some feedback for non-ActivityPub users that were confused by the terminology, so we’ve decided to simplify things and discontinue ActivityPub integration for meta.