@fdroidorg Sure... isn't too hard, just choose an ActivityPub compatible server and start posting using that server's client-to-server API. (ActivityPub has its own C2S API, but Mastodon has its own API so if you're using Mastodon you'll have to use that.) Address it publicly and the post should federate over the ActivityPub network to your subscribers.
@cwebber @fdroidorg The main question is which server we should use. Right now we are thinking either Mastodon or Pleroma, but none of us has experience with them. So we don't know what would work best for our use case. Pleroma has lower resource usage, but we don't know how much lower. And maybe Pleroma is missing some features compared to Mastodon?
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