Is there any way for my contacts to know whether I have put them in circle Close friends or Annoying acquaintances ?In Facebook, groups can be public. I could not see that directly on Google+, but maybe some APIs have access to it? Or is it something that Google considers as a an important privacy point?
Can my Google+ contacts know in which circle I put them?
privacy;google plus
From Google's own page:Who can see your circlesWhen you place people into circles, or when you share with your  circles, we won't disclose the titles of the circles people are  in. People in circles that you share with may be able to see some of  the others with whom that content was also shared.