How much career damage could you possibly do in just 140 characters? As the relatively short history of Twitter has proved, quite a bit. According to a recent survey by TribeHR, a human resources software company, 43.4 percent of businesses are now taking disciplinary action against employees who misuse social networks. Getting canned for Twitter blunders has become so commonplace, there’s even a slang term for it: “Twerminated.” But not all Twerminated Twitterers are created equal. Here are seven of our personal favorite Twitter train wrecks.