Social is an SEO strategy.
Adam Rifkin stashed this in SEO
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This really resonated with me: Fresh content = more hooks in the water for search
Adam Singer wrote this in 2009:
Simply point, the more content you have on your site, the more you are going to cover the spread of the long tail related to your niche and snag more traffic from the engines. Also fresh content keeps your site updated, which gives users a reason to come back. People don’t want to visit static sites, we’re already too used to sites being social.
It's more relevant in 2012 than it was in 2009, actually.