Does "Group Message" mean that all recipients would "see" each other?

I was wondering if I send a message to two (or more) people using iOS5, will the message automatically be a "Group Message"?

So, does that mean that in the above picture, John would know that I've sent "msg" to Peter, and Peter would know that I've sent "msg" to John?

In my experience I always see all recipients in a group iMessage - so depending on if the author of the message chose email or phone numbers I see each recipient's information.

If I have that address/phone in my address book, then I get my address book's name for the contact, but even then, I can tap on the name and determine if an email or phone number was used to address the group.

On the iPhone, there is a group message toggle - but at iOS 5.1.1, it doesn't seem to matter whether this is on or off on the sender or the receiver - I still see everyone in the group iMessage. As far as I can tell, that switch doesn't do anything on an iPhone and isn't there to even help on an iPad / iPod touch.