classify some of the private posts

All the private posts I looked at showed "Shared privately" instead of "Limited", including very recent and very old ones. That's not to say that "Limited" might not show up somewhere else... So this would at least separate the public community posts out from the private posts.

An open question is what private community posts show in that place. I don't think I'm in any private communities (not too active in communities in general) so I didn't have any test cases.

One edge case I saw was a post that didn't have any item.access.description at all, just item.access.kind = "plus#acl" with no other keys in access. I think it was a mobile check in from an older version of the G+ app. Newer checkins seem to have the description attribute, as do older checkins done through the Maps app.