How Twitter Tracks the Flu

A team of researchers found that the social-media site can raise flags about the spread of the flu weeks before CDC data becomes available.

NEW YORK, NY - JANUARY 15: Chief pharmacist Ali A. Yasin (L) injects Juan Castro (R) with influenza vaccine as assistant Agripinno Camiolo looks on at New York City Pharmacy in Manhattan on January 15, 2013 in New York City. The state of New York has declared a public health emergency in a flu epidemic of nearly 20,000 confirmed cases in the state.
National Journal
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