This is the kind of thing we should be doing in Ireland: mapping the mood of the nation - literally. The chart is from a fascinating study by Alan Mislove, which uses data from twitter to gauge the mood of the American nation (ht New Scientist).
Some things were surprising - Americans are happiest at 6.00am in the morning (say what?!) - and others not so: Sunday is the happiest day of the week. Just like in Ireland.
Expect to see a lot more of this type of emotional mapping: advertisers, politicians and even health officials will soon be using them to better time their messages and other interventions. Mislove has made the Cartograms software available to others to use. If anyone would like to partner on some emotional map making just let me know.