The maps of give a perception of how Twitter and Flickr re used worldwide and where they are used the most. These activity maps show the dots of different colors. The blue dots are tweets, the ornage ones – Flickr and the white dots are both - tweeted and uploaded to Flickr.
World map
London
New York
San Francisco
Washington, DC
Paris
Berlin
Barcelona
Rome
Tokyo
Manchester
Liverpool
Dublin
Europe
North America
New Orleans
Los Angeles
Sydney
Hong Kong
Rio de Janeiro
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How they get the information ?
User tracking ?