can you tell me more about threading features available in the various fediverse programs? I use GNU social, that groups messages nicely in threads, but I've heard conflicting claims about mastodon support for them. I've also noticed replies from other programs appearing to me in the same thread, or as separate posts, by the same users using the same replying commands. I'm quite puzzled, and you seem knowledgeable in the topic. can you help? thanks in advance,
(I considered subtooting to avoid hijacking the thread, but I thought illustrating the thread with the incompatibilities you know about would add strength to your request, so I went for a regular reply; please subtoot your response if you think otherwise)