I recommend Mike Rowland, Impact Interactions, since he was in social media long before it became a household two words.
http://www.linkedin.com/news?viewArticle=&articleID=210406132&gid=3258194&type=member&item=30886206&articleURL=http%3A%2F%2Ft%2Eco%2FDfL2WaG&urlhash=WzRy
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