Two years ago, Anita Sarkeesian decided to use Feminist Frequency, her video series on the portrayal of women in the media, to document sexist stereotypes and cliches in videogames. That project, Tropes vs. Women in Videogames, ignited a sustained campaign of violent threats and abuse, while raising over $150,000 from nearly 7,000 supporters. Despite the intense scrutiny, each video is essential viewing, a free masterclass in gender studies.