Social sickness: How Twitter can tell you (up to eight days in advance) when you are going to get il

[The Dragon Master]

Twitter may already be used to plan social lives, interact with celebrities and communicate with friends.

But now a researcher believes the social networking site could have a far more serious use - tracking disease.

Researchers have already used the site to track flu as it spreads through New York using a 'heatmap' of users who complain of being ill.

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