It's startingly simple: It doesn't take very many votes at all to get a product flagged as "inappropriate" and booted off the rankings. He says he created a script that generated a list of product IDs for every gay and lesbian book on Amazon. From there, he just needed a whole bunch of people to flag the books as inappropriate, which wasn't hard, because simply getting someone to go the URL of a successful flag would count as another one. Using an invisible iframe on popular websites owned by friends and a group of "third-worlders" he hired to register accounts, he generated enough votes to de-list gay and lesbian books en masse.
More from Gizmodo
we all would have been better served if this exploit was directed at oprah's book club.