I define Social SEO as the ability social media has to help your SEO efforts by creating shareable, optimized, high quality content. Social Media and SEO need more things that tie them together.
"The fellas at SEOMoz conducted their own Social SEO study which said: While all three networks did have a positive correlation, the strength of the relationship was strongest for LinkedIn. So, while LinkedIn may be the least obvious choice for sharing activity, it is still incredibly important for marketers also interested in SEO performance".
Via Antonino Militello