this post was submitted on 19 Jul 2023
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Fediverse
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My understanding is that any service that uses ActivityPub can see everything from every other service, unless the developers choose not to show it. As for whether Lemmy's developers choose to show stuff from Mastodon, I'm not really sure.
But arent other services just structured to differently? Like if we have upvotes on lemmy how could they translate to favourites on mastodon.social as a metrik?
I don't really know the details of how they would translate from app to app, but I do know that ActivityPub is specifically designed to allow all of its apps to pull the same information. If an app utilizes ActivityPub, it inherently has the capability of displaying all of its components.
If anyone sees that I'm wrong on something here, please feel free to correct me.
It all uses the ActivityPub protocol, so interoperability depends on what end points are used. In this case, favorites on Mastodon and upvotes on Lemmy use the same one as far as I understand it, so they are compatible. If you see a post from a Mastodon user on Lemmy and upvote it, it should translate to a favorite on their end.
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Lemmy downvotes are ignored by Mastodon and Kbin.