Some say that Google + vote (including facebook like, twitter share, and so on) on an article can boost our article ranking on SERP. But after reading an article on seroundtable i am confused about it's benefit since thay say that it has no direct impact on our ranking. The quote is here:
You can now stop clicking the +1 button on my articles, they have no ranking benefit.
Eric Enge published an exhaustive study named Direct Measurement of Google Plus Impact on Search Rankings. In short, Google+ has no direct impact on your Google rankings, outside of personalization and of course, getting visibility out, which has a side impact of possibly getting more links. But standalone, Google+ has no direct impact on your rankings.
What do you think about this? Do you agree with that?