this post was submitted on 20 Mar 2025
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It's a bit confusing because each action on the Fediverse uses the same universal language, but each service translates that language into their own specific rolls for their service.
Lemmy upvotes use "Like" which is common language in ActivityPub but down votes use "Dislike" which is ~~not~~* also used in the ActivityPub language. It's up to the other services how they interpret that. Mastodon favourites use "Like" but it has nothing for "Dislike". Mastodon boost uses "Announce" which is what Lemmy uses for posts and comments to a community.
There are also some actions that use the ActivityPub language on both services but one simply just doesn't send that action to the other service. Mastodon users can follow Lemmy users but Lemmy users cannot follow any users. I think Mbin does allow following users.
From the Lemmy ActivityPub documentation
From the Mastodon ActivityPub Documentation
Dislike is an Activity type defined by ActivityStreams, which is the basis of the ActivityPub vocabulary.
In hindsight, I wrote that line after seeing some code on Github that I thought was for ActivityPub, but when I went back to it later I realised it was for Mastodon.