A note on the system used here
DebateGraph
DebateGraph is a versatile tool for responding to complex issues and communicating complex topics and stories. It can be used by individuals or groups. It is in use in over 100 countries and has many different presentation/edit modes ("Views"). Make sure to check out the different Views from the Views menu if you have time.
Christiane Amanpour introduces Debategraph
on "Amanpour CNN" in 2010
Project partners so far include CNN, the White House, the UK Prime Minister's Office, The Independent newspaper and the UK Foreign Office.
The system is free to use, self-supported through training and consulting projects.