Tracking flu epidemics with Twitter
FluTweet uses fresh Twitter data to track global flu epidemics. Tracking is based on counting tweets that contain flu-related keywords, such as flu, influenza or sore throat. Prevalence of those keywords should correlate with flu activity, since people often tweet about their flu or flu-like symptoms.
This tracking tool is still in a very early phase and all feedback is welcome. You can find more information on FluTweet here.