It's a list, not sure it's supposed to be a ranking, because if it is I'm not sure how Facebook (#47) and Oprah (#40) could rank below CS Monitor (#14) or Publish2 (#39). Looks to me more like a fairly random collection of companies in media. It isn't tech-centric (no Apple, no TechCrunch), , it isn't ad, marketing or social media centric.
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http://www.mediapost.com/publications/?fa=Articles.showArticle&art_aid=129945