I just checked out this article on the Complexity and Social Networks Blog: Mood, twitter, and the new shape of America and within it they had a great little video that shows how the mood (and volumne) of tweets changes over the course of time across the USA.
The color represents how happy people are (red=less and green=more). The size of the state (they get pretty distorted) shows how many tweets, relatively speaking, are coming from that state.
If you pay close attention you’ll see that West Virginia is always red; or always as sad as can be. That is a bit disappointing really, but, I guess, not all that surprising.
Here is the project homepage for more information on the video and the data behind i