The problems of cloud sourcing and geocoding information about Flu outbreaks are hardly new - My student Andrew Murdoch gave a talk at FOSS4G in Victoria (2007?) about it and we have presented else where too - see http://mapcontext.com/autocarto/web/documents/AutoCarto2008/Turton.pdf for our latest paper.
One of the problems with the latest attempts is the use of twitter where you get even less context to work with than the blog entries we used. Ian
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