Google has taken the step of integrating your Google+ contacts into your Gmail account.
Now, when you start typing an email contact into the 'To' field in Gmail, Google will provide Google+ contact suggestions as well as the usual Gmail ones.
You’ll notice that these Google+ connections use the person’s name only, which means that your email address won’t be revealed to any old casual Google+ acquaintance. Your email address will only be revealed to a Google+ contact if you respond to their email.
Google had already begun this integration process between its Gmail and Google+ services more than two years ago, when it enabled Gmail to automatically update contact information with data culled from Google+ profiles.
This new feature also makes use of Gmail’s category system. If a Google+ contact from your circles sends you an email, it will appear in your Primary inbox as usual. However, if they’re outside of your circles, it will pop up in the Social category, and they’ll be unable to start up another conversation until you respond or add them to your circles.
If the thought of receiving yet more email from people you hardly know doesn’t fill you with joy, you should know that it’s possible to turn this new feature off altogether. Just head into your Gmail settings and switch the 'Email via Google+' option to 'No one,' or limit the feature to those in your Circles.
The Gmail team has begun emailing customers with information on this new Google+ integration, so it should be available to everyone soon.
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Via: Google Blog