Cornell University. "If you're happy and you know it: Researchers trail Twitter to track world's mood swings." ScienceDaily, 29 Sep. 2011. Web. 30 Sep. 2011.
Researchers at Cornell Univeristy are comparing the correlation of daylight and somebody's mood. The University is using social media, such as Twitter, to research these affects. Before the social media, the researchers were relying on some homogeneous samples. Now after working with twitter, two researchers discovered two times a day where the positive attitude was at its highest peak, these times being early in the morning and again towards midnight. They believe these times may be because of work related stress.They also discovered positive feedback takes place on Saturday's and Sunday's, as well. These patterns were continuous throughout different cultures and countries. The researchers found no correlation between daylight and mood but they did find a correlation between the gradual decrease of day length between summer and winter. After reading this article, you need to look at correlation vs. causation. Work-related stress may not be the reason for the correlation between positive moods and two positive peak times. The two times may just be because these are the times when people are not at work therefore they have the time to make 'tweets'. Researchers should also take in perspective the type of jobs these people have.