Overcoming Bias - New York City Mailing List. The referenced email was a response to an email about the blog, not to the professor.
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8gwern
The professor did link his name/email to the post by mailing us; and he specifically said "Please do not leave a comment on the class blog."
I am guessing he wants students to feel free to write what they think without worrying about being criticized or corrected on every point by aggrieved LWers.
Link.
Given the positive reactions, I think the professor seeded them with a positive impression of the site's content.