Google Displays the First Failure
Depending on where you were connected to Google +, the user itself has received several reports of multiple emails alerting them that a friend had added to his private circle. The first complaints about the massive reception of spam came through Twitter, and it called attention to some users that were receiving up to 50 identical e-mails with the same message: spam.
At the beginning of unknown causes that could generate this flaw in the system of sending electronic mail to Google +, while Twitter is recommended to cancel the notification system and return to their activation to solve the problem.
Hours later, from a message sent by Vic Gundotra representing Google + it was known that the error itself lasted about 80 minutes and the error was because Google + ran out of space on your hard doing the tracking service notifications that the system continued to send them automatically without repair than it had done before. From: Google is apologize for any inconvenience that may have cause to users receipt of these repeated messages.
For now discard any breach of security and some group of hackers may be behind it.
