First this though, as far as SEO goes, the Google Plus profile pages no longer have PR and Google Plus has turned off the dofollow links from their comments (just like it did on YouTube). Why Google exactly changed it’s policy, we’ll never know. My guess is that Google Plus was using this very dodgy tactic to attract webmasters to help it compete with Facebook. Like I said, very dodgy way of trying to get your social solution used.
What still helps is getting G+ ‘likes’ because Google is using these into their search engine query results. Or at least they want to use it because there is little to no adoption of G+ buttons on sites and if used they show little to no interaction movement with internet users. And that lack of human interest in Google Plus and that G+ button is a MAJOR problem for Google.
Sure, certain researchers (like U.S. analyst Paul Allen) say that Google’s social networking site will have more than 400 million registered users by the end of 2012. But surely, Allen is confusing ‘users’ with ‘members’. A ‘user’ would indicate that he or she actually ‘uses’ the services. Hardly anyone is actually ‘using’ it as such, reducing every profile to just a membership and that’s it.