Pulse of the Nation: US Mood Tracked Through Twitter

Using the Google Maps API and 300 million tweets over three years, a group of researchers from Harvard and Northeasten universities have been able to identify the areas of the US that seem to be happiest by time of day and day of the week.

The resulting data has been visualised in the video below, with regions expanding or contracting in relation to the volume of tweets.

For the full story, check out the original Mashable post