I'll take a look. Ty for pointing me the NIP.

edulopesf

https://github.com/nostr-protocol/nips/blob/master/99.md

I have no idea if anyone is using it, but it wouldn't be difficult to get info on it's usage. Just check a bunch of relays for 

nostr

Craigslist on NOSTR? 

There's a NIP for that:
https://github.com/nostr-protocol/nips/blob/master/99.md

I have no idea if anyone is using it, but it wouldn't be difficult to get info on it's usage. Just check a bunch of relays for ```kind:30402``` notes.