@larsmb For the technical nerds: Replies are stored as collection to the original post in ActivityPub. So being allowed to decide which replies to the unique ID of the post are shared in that collection can be delegated to the OP (Original Poster). Replies that reference said Unique ID can still be shared by other instances but some sort of indicator implying "not endorsed by OP" when not listed in the reply collection is quite simple to implement.