What *exactly* does 'Shared Privately' indicate in the context of an activity from the Google+ Domains API?

Question

Consider the following G+ Domains API Response payload (snippet):

{
   ...
   ,
   "provider": {
    "title": "Google+"
   },
   "access": {
    "kind": "plus#acl",
    "description": "Shared privately"
   }
}

What exactly does shared privately mean? As far as I can tell, it's any type of activity that has not been explicitly shared publicly. Am I correct?

Answer 1

The activities resource documentation covers most of this. description is just the user visible name of the acl state. The access.items[] fields are what actually dictate the visibility of the activity. I believe that "shared privately" is generally used when a specific list of people have access to the post.