Doctors say Twitter may be able to help them track HIV and drug activity.
Researchers at UCLA analyzed tweets posted between May 2012 and December 2012.
They searched for phrases associated with risky sexual and drug activity then plotted the tweet on a map to see if it originated from an area with a high HIV prevalence.
They found an association between risky tweets and counties with the highest HIV cases.
They hope to use this information to predict where HIV cases may occur and set up prevention efforts in those areas.