nostr:npub17l2zfdwp4f28llxjqs6udvtda8z6k6th2pdmdfjvlpcwxcvv285qw6v5xu nostr:npub1njst6azswskk5gp3ns8r6nr8nj0qg65acu8gaa2u9yz7yszjxs9s6k7fqx hop up. Nostr has groups before ActivityPub?