Twitter posted some amazing maps of tweet volumes composed of all tweets which were geo-taged since 2009 – that’s over 4 years of billions of tweets. Maps shows tweet densities by cities and continents around the world.
Twitter posted this description their blog along with the maps:
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.)
Below are all the details maps from Twitter’s flickr account: