World cities - Global networks 

The networking of large cities at the global-national level results from corporate organization within the global economy. There are a range of sub-systems:
- An Asian sub-system
- A North American sub-system
- A West European sub-system
- Southern Hemisphere sub-system

World cities are supported by and connected to one another by:
- a very comprehensive transportation system
- an extensive information network                
- Telecommunication networks



Examine the visual display of the number of tweets being sent out at Tweetping. How does this represent a global network? How does it relate to the topic of World Cities?

Information-rich Visualisation of Dense Geographical Networks

In pictures: Global flight paths