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@janeadams @Jain you're welcome. Well, that's the demonstration of what the Fediverse, based on ActivityPub at least (which has flaws too, of course), is.
DIfferent platforms are able to exchange info via a communication protocol.
As an example, my WordPress blogs, equipped with the ActivityPub plugin, are now part of the Fediverse too, and are seen as instances ("servers") you can subscribe to, see posts (automatically published) and comment, just like you would "normally"...