“Sick City is a new Twitter mashup that tracks people’s tweets about being sick, having sore throats, and other physical maladies. The public health benefit of this? “The tool lets you track these occurrences both by city and each specific ailment. And the stats go back to the last 31 days, which can show you if a certain type of sickness is trending.”
Article
Vivian Distler, Health Horizons, 19 March 2009

