You've got to tell them. They're so wrong. What an idiot. Unbelievable. This will show them. Getting angry on Twitter may feel great (correction: amazing) at times, but that doesn't mean it's good for you. Researchers at the University of Pennsylvania have found a strong correlation between use of negative language on Twitter and heart disease mortality. From public tweets made during 2009 and 2010, the research found that communities where expletives and hate words were tweeted often also had higher rates of heart disease deaths. Positive tweets, however, showed the opposite effect.