In April 2009, it was publicized that some lesbian, gay, bisexual, transgender, feminist, and politically liberal books were being excluded from Amazon's sales rankings.[326] Various books and media were flagged as "Adult content", including children's books, self-help books, non-fiction, and non-explicit fiction. As a result, works by established authors E. M. Forster, Gore Vidal, Jeanette Winterson and D. H. Lawrence were unranked.[327] The change first received publicity on the blog of author Mark R. Probst, who reproduced an e-mail from Amazon describing a policy of de-ranking "adult" material.[326][327] However, Amazon later said that there was no policy of de-ranking lesbian, gay, bisexual, and transgender material and blamed the change first on a "glitch"[328] and then on "an embarrassing and ham-fisted cataloging error" that had affected 57,310 books[329] (a hacker also claimed to have been the cause of said metadata loss[330]).
Amazon Disputes Hacker Claims of Ranking Manipulation
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