I don’t recall using circles, just have third hand info. Can you describe circles, how you might use circles, why you want this feature?

A couple of the feature videos seem to have disappeared in the last year. This one is okay. Basic idea is choosing whom you share content with, and curating/filtering who's content you see. Wicked cool to use, but I can't even conceive of how it would work on Nostr/clients. Communities is a step in the right direction though.

Contact lists also close-ish to the mark.