Can you measure happiness? For many people happiness is subjective and not so easy to measure, however, a person’s mood level is easy to detect from their choice of words and their emotional content.

Alan Mislove and his colleagues at Northeastern University filtered 300 million 140 character tweets posted on twitter from 2006 to 2009 and measured them against a psychological word-rating system to assign a mood score reflecting positive vs negative mood level.

Check out the below visualization by location during the day… results are facilitating… people on the west coast of the US are happier than those on the east coast: