A Minnesota high school senior who asked 600 porn stars to prom on Twitter will not be allowed to bring the one who said yes, his school said. Mike Stone, 18, tweeted to his prospective dates: "i have dinner hotel and ill give u a massage to." The teenager told ABCNews.com he turned to Twitter after several girls at Tartan High School in Oakdale, Minn., turned him down. "I didn't expect this to get blown up. It's great. Everyone at my school is supporting me," Stone said. But school administrators...