Who can see?

Who can see private posts in this group? just author or anyone with membership?
Can anyone who is not a member see a public post?


Seth says
anyone, even a guest can see any public post in any group.

only members of a group can see the private posts in that group.

Mark de LA says
OK so I posted a private thought this AM can you see it & do you know about it in the news? You are a member of the group.