only do so for public and unlisted posts

activities/models/post.py

@@ -765,6 +765,7 @@ class Post(StatorModel):
         targets = set()
         for mention in self.mentions.all():
             targets.add(mention)
+        if self.visibility in [Post.Visibilities.public, Post.Visibilities.unlisted]:
             for interaction in self.interactions.all():
                 targets.add(interaction.identity)
         # Then, if it's not mentions only, also deliver to followers and all hashtag followers