The short answer is yes. And no. 🙂
Matt Cutts explains in the video below. In a nutshell, he says they haven’t specifically changed the way social media links count toward your site, but they’re always changing the algorithm and some of the changes certainly could have had an impact. They’ve made about 300-400 changes in the last year, and some of those may have had an effect on the weight of social media links that point to your site.
Anyhow, watch the short video below for Matt’s full answer:
Jomomma says
Google’s new recent changes in April 2009 blow big chunks .I can’t find anything anymore ,why do websites change when they are already perfect ?Numetal rocks !!!I love numetal