300 million tweets reveal the afternoon at work is the unhappiest time of day
A team of five researchers at the two schools studied 300 million U.S. tweets from September 2006 to August 2009 and performed sentiment analysis on them. They found that the evenings (presumably when people get off work and are socializing with friends) and early mornings (before work) are the happiest times of the day. You can see in the map to the right that around 4 p.m., the map becomes bright red, indicating negative emotions. The trend is distinct on both the East and West Coasts.
