Want to get invited to Google+?
I assume that you are logged into Google plus. In case you are still not the part of this amazing service your can leave your emails in the comment section of the link provided.
Now once you are loged into your profile Go to Profile >> Edit Profile.
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Once you are done adding more accounts, click save and its all done. This was quite easy.
If you are not the part of Google + leave your email on the post. I will try to add as soon as i could.