So there's been an internet kafuffle.
Amazon may or may not be deliberately removing gay/lesbian/rape recovery books from their ranking system (and therefore making them more difficult to find through searches). This may or may not be the result of a third party troll, a co-ordinated attack by pressure groups, glitch in Amazon's software or an unforseen emergent memetic effect.
There's an article and collection of links
here that sums it all up better than I could.
Twitter is brilliant for inciting outrage, panic and snap boycotts!