Comment by bhanks

ditto. There are huge problems in filtering authority with such a massive source of real-time information that is so easily gamed. The barrier to tweeting a link is magnitudes easier than putting up a new webpage. I would argue that the only real value they are getting currently is rel="author" information with plans for giving value to other signals later. I really think the SEO hype about social media is an extension of the hype the article talks about.