Wouldn't that result in a poor user experience (compared to say reddit) where a user needs to switch in and out of different sites/tabs for different conversations? I suppose someone could build separate nostr sub forums as suggested, then with a service that allows you to compile all the separate forums into a single visible thread, ala reddit? Is that the thought? So someone can go build Baseball.News, Football.News, etc. I guess I dont like the idea of different sites/forums for each, but perhaps I am just thinking of this incorrectly/have the wrong mental framework right now.