+Vic Gundotra of Google+ announced some of the key official statistics during Google Plus Updates event on Tuesday.
Official Google+ Statistics Oct 2013
20 Google+ updates released in last few months
18 new updates released today
During Google I/O 2013, Google+ had around 290 million active users and now jumped to 540 million active users as of October 2013 signed in and active through Google+
Over 190 million users used the stream (during last update) and now that has jumped to 300 million active users in Google+ Stream
Over 1.5 Billion photos uploaded every week to Google+ photos