Research from Harvard University titled ‘Pulse of the Nation: U.S. Mood Throughout the Day inferred from Twitter‘ has created a fascinating model using ‘happy and sad tweets’. Using data from the U.S. Census Bureau, maps from Wikimedia Commons, user locations inferred using the Google Maps API; all displayed perfectly using a PostGIS cartograms. Check out the video:
[youtube=http://www.youtube.com/watch?v=ujcrJZRSGkg&feature=player_embedded]
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Robbie McGregor 
Reece Broome 
Jacky Tse 
What People are saying….