"You may have noticed that when someone posts something in your stream, you can see who it was shared with. If you look at the top of the post you'll see either Public, Extended circles, or Limited, and clicking on that shows you more details," he writes.
"Today we are introducing the same feature for photo albums, so that you can comment on photos knowing who will be able to see your brilliant, witty, clever remarks," he adds.
This is basically an extension of the sharing concept Google+ launched with (which Facebook is now emulating), which makes it clear who can see what wherever it makes sense. This concept has been one of the main drawing factors of Google+ for some users since the beginning, though Facebook's new announcement may counter that to some extent.
In addition to that, Google+ VP of Product, Bradley Horowitz, says that users can expect to see some "exciting" new things coming to the share box "literally in days."