Rihanna Defends Controversial "Man Down" Video

She's being criticized over the violence in her new video for "Man Down," but Rihanna certainly isn't taking any of it lying down.

Just one day after such outspoken groups as the Parents Television Council, Enough Is Enough and Industry Ears took issue with the video—in particular, a scene that shows the singer shooting a man who had assaulted her—Ri-Ri has snapped back at 'em via Twitter...