Conflict of Interest Disclosures: Dr Ayers owns an equity stake in Directing Medicine LLC and HealthWatcher Inc, both consulting groups that advise on the use of social media and news media for public health surveillance. Dr Dredze has received consulting fees from Directing Medicine LLC and Sickweather LLC, who use social media for public health surveillance. Bloomberg LP provided salary support for Dr Dredze, but did not have any additional role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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