You can make your own private network that is cryptographically unable to replicate with other networks (like the main net), but I don't think you should ask cl

You can make your own private network that is cryptographically unable to replicate with other networks (like the main net), but I don't think you should ask close friends and family to edit ~/.ssb/config to add a custom SHS key. As much as I've loved working on Scuttlebutt, I can't recommend using it for this use-case.