After an extended spat with one of his presumably many daily Twitter haters, the endlessly infantile Chris Brown has deleted his account. Comedy writer Jenny Johnson's grudge with Brown seemed, naturally, to center on his horrible abuse of Rihanna. Brown's comebacks were characteristically out of bounds, using a wide range of disgusting sexual imagery. One of his final tweets: "Just ask Rihanna if she mad??????" The answer seems to be no, as Rihanna tweeted a photo of a shirtless Brown lying in bed on Saturday.