>>108315Quotes are actually irrelevant, the arrows on the left do the chart a disservice.
Framed in a different way, the structure is about whether a thread can "split". See pic, the color of a post/reply changes each time this happens. On the left are SE and Slack, which can only split once per main post to create a sub-thread, on the middle is Reddit, which can split with no limitations, and on the right is SpaceBattles, which cannot split.
Chatrooms have a special status where OPs don't exist, but we can easily treat the room itself as a single thread, it doesn't make a real difference.
>>108319That's a good one, I'll add it to my notes.