First of, I’m not entirely sure they are the same to be honest, sometimes I see discuss.site-a.com
while others it’s discourse.site-b.com
?
Anyway, are these federated in some ways?
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Not an official implementation, but there were extensive talks about it and someone was working on a plugin.
Is that only between an instance of discourse and the rest of fediverse? Does it also apply for different discourse instances talking to each other?
Essentially, I’m wondering whether I can use 1 account to comment across different forums.
No the software in this case is a classic forum software and stands alone.
You can use any subdomain for any type of instance but if you see it on lemmy then its federated.