To verify if you have guessed someone's correct gmail address you can always do this - http://mindprince.blogspot.com/2012/12/google-plus-profile-google-contact

To verify if you have guessed someone's correct gmail address you can always do this - http://mindprince.blogspot.com/2012/12/google-plus-profile-google-contacts-privacy.html http://mindprince.blogspot.com/2012/12/google-plus-profile-g... Works for all those who have upgraded to Google+.