by the BBC
Software-based disease alert systems are considered to be excellent indicators Type in a search for flu in Google and you will not only find out how sick you are but your data will also be recorded on its flu monitoring service. The service, which is part of the search engine’s philanthropic arm, google.org, is just one of many software-based disease alert systems dotted around the worldwide web. By gathering aggregate data from millions of people or by scouring the web for online news reports, blogs and chat room postings, these programs are considered to be excellent indicators of disease levels across the globe.
http://www.bbc.co.uk/news/technology-12176180
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