I help admin a roller derby team that uses a private facebook group for that at the moment; and one thing facebook has started doing fairly recently is to tell you who has seen a post you’ve made.
I’m trying to get us to a discourse instance instead, for various reasons, and this is one piece of functionality that the league admins actually use - it lets them see who’s read or hasn’t read announcements, for instance.
Does it exist in Discourse yet? I’ve had a poke around and can’t find anything obvious. Would a patch to add it as an option be welcome? Whether “has seen” should mean “we’ve rendered the topic title for the user”, or “the user has entered the topic” is a question that might need clarification, of course. I’m not sure what it means in FB at the moment.