Comments on Places ftw.
This is an interesting new spec that will allow you to make threaded replies to pretty much anything: geographical areas, websites, hashtags/topics, urls, podcasts, books, movies, papers.
https://github.com/nostr-protocol/nips/pull/1233
right now you can really only make threaded replies to kind1 notes and trying to do it on other things is kind of janky. generic comments fixes this.
Discussion
you basically get nextdoor for free