@garry yeah that's why I stopped when I noticed it was only #Fedilab. But so far as I know, #ActivityPub is agnostic about what goes into a message, it is the sender and receiver who just agree. I can see danger with links, but surely a simple subset could be agreed upon, just what handwriting had, emphasis, underlined and quined, I'd be happy. Ok, maybe 'code' too.
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Maybe relevant is that ActivityPub would support a new type of message that was explicitly markdown enabled.
You're right that AP doesn't really care what you put into a post, but it supports different types of posts, and it is open to creating new types of posts, so one could create a post that specifically said, this post type is for markdown content.
Just a passing thought.
@volkris @garry
LOL, it's html email all over again! 😅