Data-mining checks the pulse of global happiness

The researchers have for several years been plotting happiness based on about 50 million English-language posts a day on Twitter, but last month made the graphs available to the public via a website.

They plan to extend the reach of the hedonometer by adding information collected from Google Trends, the New York Times, CNN and link-shortening website Bitly, and to mine data in 12 languages, according to an announcement from the team at the University of Vermont.