Yes, kinda like a private chat room. But not sure how the key distribution to the circle of friends would work and another one idea might be just via private relay that only by my approval notes can be seen by others. Idk I’m dumb
Discussion
A private relay would get you part way there. The big problems I see with it are:
- People who do have access could still easily "broadcast" or boost" your notes and they could be published to other relays (perhaps b/c they didn't realize it was intended to be private)
- You'd need a different relay for each group. So one for your snowboarding friends, one for your gun friends, one for cross fit, another for cross stitch, and so on
AFAIK there's no way to express what you'd like people to do with your posts. Being able to include things like "no sharing" seems like a good one. There's no guarantee that people and clients would respect that, but it'd be better to at least have the freedom to express what you want.
Everything can be limited and set up on the relay. But the current relay implementations aren’t good. At least by default there could be some restrictions for the operators not to log IPs
Sure, for limiting the initial distribution, but once a client has a note, they can do whatever they want with it. Including boosting it to all the relays they use.
If client like Damus has anonymous, private, public, features for zaps why wouldn’t client have the same features for notes? “broadcast only to your followers” option for example 
There needs to be something in the protocol that allows them to specify this. I believe the zap privacy is just about whether the client posts a public note on Nostr that says you zapped their note, or posts a DM, or posts nothing at all. And I'm not sure how that last option differs from anonymous.
That's not just a Damus thing, either. It's in Amethyst too, and I suspect is a defined standard somewhere.
A NIP saying note type XYZ is for notes that can't be shared (boosted, broadcast, etc.) but are otherwise to be treated like type 1 notes.
Sure, there should be a NIP for this, but it’s disappointing that no one is bringing these ideas forward. Devs have stopped listening to users here!