"One of Marlow's researchers has developed a way to calculate a country's "gross national happiness" from its Facebook activity by logging the occurrence of words and phrases that signal positive or negative emotion. Gross national happiness fluctuates in a way that suggests the measure is accurate: it jumps during holidays and dips when popular public figures die. After a major earthquake in Chile in February 2010, the country's score plummeted and took many months to return to normal. "
http://www.technologyreview.com/featured-story/428150/what-facebook-knows/
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