China has lashed out at Germany after its foreign minister called Xi Jinping a “dictator” and summoned Berlin’s ambassador for a dressing down, in the latest flaring of tensions with a western democratic power over how the Chinese leader is described overseas.
You need both. For a comment you even need the community instance, the poster instance, and the commenter instance to all be federated
That’s confusing.
Basically, everybody needs to agree before access is granted.
It is the best way to block spammers and trolls.