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Threads has hashtags now
(www.theverge.com)
A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, KBin, etc).
If you wanted to get help with moderating your own community then head over to !moderators@lemmy.world!
Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration), Search Lemmy
But this doesn't look like it will be compatible with current ActivityPub, right?
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.
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.
calckey can do multi word tags too