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http://vandelaydesign.com/blog/social-media/seo-vs-smo/
http://www.seo-scoop.com/2008/06/30/seo-vs-smo-traffic-quality-test/
http://www.vanseodesign.com/blog/social-media/social-media-optimization/
http://www.scribd.com/doc/69260/SEO-vs-SMO-A-Graphical-Analysis
http://www.seobook.com/can-you-trust-marketing-statistics