ActivityPub can support tags with spaces, even though no fediverse platform allows you to write tags like that. The name of the tag can be pretty much whatever you want, as long as it has a valid URL.
Comment on Threads has hashtags now
johntash@eviltoast.org 11 months agoBut this doesn’t look like it will be compatible with current ActivityPub, right?
0x1C3B00DA@kbin.social 11 months ago
cupcakezealot@lemmy.blahaj.zone 11 months ago
calckey can do multi word tags too
Chozo@kbin.social 11 months ago
I don't see why not. Mastodon could just translate multi-word hashtags into underscored hashtags. There's already some unsupported features from forks like Firefish that get translated, like emote-reactions register on Mastodon as favorites, etc.