Earlier this month, an anonymous message was posted to the discussion-board Web site 4chan. In it, the author threatened to hurt the video-game developer Zoe Quinn: “Next time she shows up at a conference we … give her a crippling injury that’s never going to fully heal … a good solid injury to the knees. I’d say a brain damage, but we don’t want to make it so she ends up too retarded to fear us.”