i’d like to give them a virtual lemon for joining my community
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I don’t believe — without looking at the protocol — that there’s a way to do so, unless you’re an admin on that user’s home instance.
It’s probably possible to find whether a given home instance has any users at all subscribed to your instance, since if that isn’t the case, it won’t be receiving posts to your community. But I don’t believe that home instances expose subscriptions.


