At first I was confused, why isn’t this enabled? So I dug a bit deeper, and found out how to enable Google Plus.

Hit up http://plus.google.com and log in

Then select your Account settings page :

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Now select “edit profile”

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Now you should be in the area where you can change your biography information, you can also select the drop down for private messages/emails.

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You can select many options to enable messaging. Got to love how customized with your security google let’s you be.

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Now just save your options, and you’re good to go. This is what users/gplus people will see if they’re allowed, and you/they have messaging enabled :

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If you’re not allowed, or the user does not have it enabled, you won’t see anything.

enjoy :)