The geography of Tweets

The #geography of #Tweets - #Twitter - Twitter Blog:

Those of us on the Visual Insights team are obsessed with the patterns that emerge from aggregated Tweets over time. A continuing curiosity is about the geographical shapes that surface in geotagged Tweets. The images we’re sharing here use all of the geo-tagged Tweets since 2009 — billions of them. (Every dot is a Tweet, and the color is the Tweet count.)