Google's own social network Google+ is adding 625,000 new users each day, Google+ "unofficial" statistician and Ancestry.com founder Paul Allen said today.

Google+ would have nearly 300 million users by the end of 2012 if it continues to at least grow at 625,000 new users each day. The site now has more than 62 million users, but that growth is accelerating.

Allen said that could mean Google+ could have more than 400 million users by the end of 2012 if the growth keeps speeding up.

(Thanks to Mike Elgan for catching that tidbit and posting it in Google+.)

Correction: It was Paul Allen who made the call on Google's new users, not Bradley Horowitz. I apologize for the error.