By and large, most folks tend to be morning people. At least Twitter users tend to be. Those are the results of a study by researchers from Cornell University. The sociologists documented more than 2 million Twitter messages from 84 countries and found that overall Twitterers seem to follow definite daily mood rhythms: They’re fairly chipper at breakfast, get kinda cranky by late afternoon and perk up again at night. Researchers believe their results indicate that worldwide people’s moods follow some universal biological rhythms. As some skeptics might insist, folks who use Twitter are far more cheerful than they should be so early in the morning, or all their tweeting might make them more susceptible to lying. “Tweets may tell us more about what the tweeter thinks the follower wants to hear than about what the tweeter is actually feeling,” says Harvard psychologist Dan Gilbert. “In short, tweets are not a simple reflection of a person’s current affective state and should not be taken at face value.” (New York Times)