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After more than 5 days--and critical posts on TreeHugger, AdWeek, Fast Company, Emergence Marketing, Church of the Customer blog, AutoBlogGreen, TriplePundit, CityHippy, BlogHer and Viral Garden--McDonald’s is unable to ignore the buzz calling into question the authenticity of its corporate blog. Last night, VP Bob Langert began allowing comments, but has yet to respond to any of them. Langert still needs to respond to live up to his blog’s name, “Open for Discussion.”