(12-10-2020, 04:01 AM)jkl Wrote: Subject? Like, hashtags?

I'd really encourage you to come see for yourself. It works both ways. The basic idea is that we can use the convention of (<subject here>) that comes first as a way to group posts together.

The way we do this at twtxt.net is by a client-feature that adds a blake2b hash as the subject when you reply.