By performing simple filtering and normalization, we demonstrate that Twitter can serve as a self-reporting tool, and hence, provide indications of increased infection spreading. Our initial findings indicate that Twitter can detect such events up to one week before conventional GP reported surveillance data.
That is from the abstract of the paper "Swineflu: Twitter predicts swine flu oubreak in 2009" by Szomszor, Kostkova, and De Quincey (2012).
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