[_zllx]

I recall this is the exact purpose of Spectrum.chat, though it can't interoperate with Discord, it's a new chat network. It allows making conversation threads available publicly and indexed on search engines. I've seen it in Google results a couple of times, but it doesn't look like it has caught on much, likely because of the network effect required to make a closed chat software popular.

Oops... looks like it's been shut down.