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Understanding ActivityPub and Federation
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ActivityPub is what instances use to talk to each other, not what the web interface uses. So the way Communities are propagated over the ActivityPub depends on what lemmy does, not what ActivityPub wants. Are you trying to develop your own instance or are you trying to make a 3rd party UI for lemmy?
@Hexorg can't directly reply to your comment because that wasn't federated (oh the sweet irony) :D
Anyway, it's more like I'm trying to write a usenet reader, fully expecting to have to create a curated list of of instances but then finding out there is no way to see what any given instance actually contains outside of writing specific code for each and every one of them.