Good article at Yahoo Finance about Google+, with lots of details, stats, etc. Brands are putting their effort in FB, Tw, etc. Nike, Pepsi, Dominos, and others ignore Google+.
It’s Google’s fault: it looks like Google pretty much doesn’t care if brands are on Google+ or not.
Google has the money for co-promotion, but it hasn’t occurred to them. What if Google paid marketing agencies to do the Google+ marketing for Dominos, Nike, Pepsi, etc.? This has been done for decades by other companies. But Google doesn’t understand marketing.