Worth reading: +Paul Clarke
's Google+ split personality problem. This is a tricky issue for Google to solve - they seem to have been so inclusive about including putative profiles in Google+ (so you see your friends and family 2 or 3 times over in the Add To Circles app) that they have been confounded by people's typically fragmented use of email. Paul's experience is far more worrying than mine, but I'm still having, for example, another 'Peter Sigrist' profile suggested as a potential friend/connection for me. I suspect it to be merely me under a different email address, but I am not clear how to absorb it within my own identity on Google+.
Here's Paul's Article: http://paulclarke.com/honestlyreal/2011/07/google-plus-ungood/