The ever growing circle of Google+ fans was hit by a glitch which caused the system issue a massive number of notification messages to some users. The servers basically were spamming some users inboxes because the search giant has ran out of disk space, the company’s social chief Vic Gundotra explained in a post on Google+ yesterday.

Please accept our apologies for the spam we caused this afternoon. For about 80 minutes we ran out of disk space on the service that keeps track of notifications. Hence our system continued to try sending notifications. Over, and over again. Yikes. We didn’t expect to hit these high thresholds so quickly, but we should have. Thank you for helping us during this field trial, and once again, we are very sorry for the spam.

It seems a bit strange that the company which operates massive data centers around the world would have any issues with disk space, but it is possible that Google+ engineers underestimated interest in the service which by some estimates already has five million users.

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