I've just enabled a new feature I think is fun enough to announce. "Who Replied" is accessible by clicking the "Replies" number next to (desktop) or under (mobile) a thread name, when viewing a list of threads. When you click that number, you'll see a breakdown of who has participated in a thread, and how much they've participated. For example, below you can see that I am unofficially more PNW than even two of the PNW folks on this site.
Enjoy!
Desktop:
Mobile:
Result:
Enjoy!
Desktop:
Mobile:
Result: