Well, you can limit PMs you receive to Moderators and your Contacts only, or you can disable Private Messaging completely. I would think moderators and admin would still be able to PM everyone even if, "Disable Private Messaging," is chosen.
Under Edit Profile, Messaging & Notification, Private Messaging, you can tick the box next to this:
You may limit the receipt of private messages to just moderators and your contacts. Other members who attempt to send messages to you will be told that you have disabled private messaging.
__Receive Private Messages only from Contacts and Moderators
https://www.soberrecovery.com/forums...do=editoptions
I think that's what Manta meant by Friends List, above.