Latest social networking stream Google+ has apologized to its users with notification emails for spamming them and stated that the problem arose due to low disk space.

Google+, since it started conducting a field test two weeks ago, has been flooded with millions of customers, Google’s chairman Eric Schmidt revealed earlier. The initial members were mostly tech journalists. Later the website shut down invites. The company re-opened the social network to the masses last Thursday.

Please accept our apologies for the spam we caused this afternoon, Vic Gundotra, Senior Vice-President of Social for Google, wrote on his Google+ wall on Saturday evening. “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.”

The company said it had to cancel invites to continue fixing bugs and enhance Google+’s infrastructure, PCMag reported.