Maybe the gpoddersync-nextcloud app is more your thing? You can use that with all podcastapps that support gpodder sync. Works with Antennapod on Android and Kasts on KDE/Kubuntu.

Isn’t diaspora like that? They have a somewhat facebook-like interface and rely on ‘aspects’ to define how public or private something is. It is listed on the fediverse map, though it doesn’t use activitypub but a different protocol.

Yes it’s a fediverse platform mainly focused on sharing pictures.

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