Logan Morrison says at first he thought Twitter was lame, although he uses a more colorful adjective because he’s a 23-year-old ballplayer who’s a fan of Dave Chappelle, and he talks like one. Morrison gradually became hooked on Twitter and now has more than 26,000 followers. But the left fielder known as LoMo may lead the league in Web wisecracks. Few athletes are wittier on Twitter. “It’s amazing how many people take you seriously,” he says. “I don’t take it seriously at all.” That’s what worries team president David Samson. The Marlins monitor tweets by all of their employees, and Samson says he has warned Morrison that his R-rated material could carry negative repercussions.