By Joseph Salvador The quarterback is just as dangerous on Twitter as he is on the football field. View the original article to see embedded media. Tom Brady is just as lethal on Twitter as he is on the football field these days. The seven-time champion will never let an opportunity to embarrass his former rivals pass him by and Monday he went viral with a shot at Peyton Manning. Manning, Brady’s longtime rival and five-time MVP, has often been teased for his forehead and Brady just couldn’t help himself. The 44-year-old posted a video on Twitter of him practicing, but the camera angle showed …