kind-scoped follow

FA.md

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+NIP-FA
+======
+
+Kind-scoped follows
+-------------------
+
+`draft` `optional`
+
+This NIP defines kind `967`, a kind-scoped follow event.
+
+```jsonc
+{
+  "kind": 967,
+  "tags": [
+    ["p", "<followed-pubkey>", 'relay-url'],
+    ["k", "<some-kind>"],
+    ["k", "<some-other-kind>"]
+  ]
+}
+```
+
+Multiple `p` tags and multiple `k` tags are allowed.
+
+The `k` tag(s) define the scope of the follows.
+
+### Unfollow action
+
+Unfollowing is done by deleting the follow event, copying over the `k` tags from the follow event.
+
+```jsonc
+{
+  "kind": 5,
+  "tags": [
+    ["e", "<follow-event-id>"],
+    ["k", "<some-kind>"],
+    ["k", "<some-other-kind>"]
+  ]
+}
+```
+
+### Constructing specialized follow lists
+
+A client can fetch the events of the kinds they are interested in, and perhaps adjacent kinds if they choose to. For example, a client specialized in videos might also want to extend its computed follow list to include events related to live streams.
+
+Clients can use the last `kind:967` and `kind:5` tagged with a `k` they care about and use the last `created_at` they have seen to REQ for updates.