@J12t An important distinction arises out of the immediacy of the posts and responses. We expect posts in Chat apps to be seen very soon after they are created. And, we expect Chat responses to be published almost immediately. On the other hand, when publishing in something like an NNTP newsgroup, one expects that some will see posts soon after they are created, but many will not. Responses to newsgroup content are often still useful even when published many years after the initial post.