Yes, it might not look like it in your timeline, but 400m people have upgraded their Google accounts to the Google+ social network, according to SVP Vic Gundotra. “It was only a year ago that we opened public sign-up, and we couldn’t have imagined that so many people would join in just 12 months,” he writes. The caveat: this is just people who’ve clicked a box when prompted to upgrade. How many are actually using the standalone Google+ social network? “I’m happy to report that we have just crossed 100,000,000 monthly active users on Google+,” writes Gundotra – a figure that includes the website and mobile apps. A bustling cybermetropolis? Well, not quite: as GigaOm points out, anyone starting a video chat from Gmail or Google Talk is taken to the plus.google.com to use its Hangouts feature, so that may be bumping up the numbers.