Thinking about how same-as and user-invites will work, I started to realize they were also somewhat like "smart contracts" (I didn't delve too deeply into the possible meaning of that term, though). Declaring two feeds "same-as" essentially publishes an agreement that A and B mutually agree they represent the same entity. I also recently suggested the same idea could be used for human groups such as "companies". It's an agreement, but it doesn't really oblige anyone to do anything, but the idea is that other feeds react to it.
User-invites are also similar to this, by inviting someone, you permit them access to your community, and also reveal a visible link between you and them. Others may interpret this to also represent certain responsibilities - such as that the host has some responsiblity for the behaviour of the guest, but nothing is formally specified.
@alanna I'm not sure would agree that crypto constitutes "private property" - I consider private property mean property enforced by the state / 3rd party violence, but I think crypto is more like a bicycle lock: the locked bicycle is left in public, but the key (or lock combination, or private key) remains my personal property. I acknowledge this is somewhat ambigious because the security of bicycle "ownership" depends on the fact that you can't really just go around cutting through bicycle locks, at least not in broad daylight, but I'm not sure if this is primarily due to police or cultural mores.