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Erm this is not really new. Most forms of online community whether it's Google+, Facebook or this forum allow you to message other users. They usually also allow you to receive the messages via email. They also allow you to choose who can message you.
The only real difference is that because Google owns both G+ and gmail it's slightly more joined up. But the same controls are there in that you can in the end choose who can contact you and whether they can see your email address.
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