Source:
Mashable Mark R. Probst, a gay romance author whose book was included in the action, writes in his LiveJournal blog:
On Amazon.com two days ago, mysteriously, the sales rankings disappeared from two newly-released high profile gay romance books: “Transgressions” by Erastes and “False Colors” by Alex Beecroft. Everybody was perplexed. Was it a glitch of some sort? The very next day HUNDREDS of gay and lesbian books simultaneously lost their sales rankings, including my book “The Filly.” There was buzz, What’s going on? Does Amazon have some sort of campaign to suppress the visibility of gay books?
Probst received the following reply after contacting Amazon through his Amazon Advantage account:
In consideration of our entire customer base, we exclude “adult” material from appearing in some searches and best seller lists. Since these lists are generated using sales ranks, adult materials must also be excluded from that feature.
Read more:
http://mashable.com/2009/04/12/amazon-accused-of-removing-gay-books-from-rankings/
Though this was discovered in late February apparently, Twitter is going nuts right now as are tech blogs etc. There is already a petition. Even books such as suicide prevention guides and pictorial histories of Harvey Milk have been de-ranked. However, other obvious "adult" related content has not been. This has apparently spread to other countries including Canada, Denmark, the UK, and Japan. This site has a link to most of the books de-ranked:
http://community.livejournal.com/meta_writer/11992.html