It would be nice to subscribe some activitypub based Blogs and get there news into a channel.
Hi Mannshoch, welcome to the Mattermost forums and sorry for the late reply!
I’m afraid there’s no native support for that and I personally have never worked with Activitypub, but if they support outgoing webhooks on certain events, they could be used to notify your Mattermost application about a chang and therefore post news into a channel.