Nostr is definitely also a community, at least based on the definition I cited in the post.

> a series of connections, and a knowledge base, and a skillset that we can't fulfill as an individual, while having a social relationship with people in such a way that we can call on them for help.

That's not to say that _everyone_ on nostr is part of the "nostr community". But there is definitely a cohesive social cluster with a significant level of shared values.