Want to see a stereotype proven right? Take a gander at this map of U.S. Twitter users’ average moods at noon and 11 pm, created by Alan Mislove of Northeastern University and his team of researchers and based on three years of work studying 300 million tweets. While just about everyone is happier at night than midway through the work day, the West Coast is indisputably more prone to using positive language than the East Coast. And those of us in New York, apparently, are always kind of pissed. (Or, at least, we’re throwing words like “rape” and “suicide” around more often.) Read more about the study here.