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I guess tech-journalists gets to try out quite a few mobile phones through their work.

Would it not be a reasonable scenario that the journalist got to try a phone and used the Google+ app with his account. Upon returning the phone, it wasn't reset properly before being sold on to another person. So the Google+ app could still be associated with the journalist's account when the phone was sold on.

Update: In this article(http://www.dagensit.no/tester/article2355417.ece) the journalist reviews the Sony Xperia S, the very same phone model that the girl uses.