Table 1.

Categories of health-related tweets identified via content analysis (n=346; content frequency may be greater than 100% because content areas were not mutually exclusive).

Tweet type	Definition	Example	Frequency among health tweets, %
Testable	An evidence-based claim whose veracity could be assessed	RT @username: Did you know? You can become more sensitive to alcohol as you get older: http://[link] #aging	53
News	Report of information or events that happened recently, often refers to traditional news outlet	“@username: State charges man with #stealing $400,000 from church, #Alzheimer’s patient, choral group http://[link] #embezzle	41
Commercial	Refers to or advertises a service or product for sale	RT @username: Learn to capture/edit/produce quality videos at ASGE’s Video Editing Course for Physicians, June 8-10, Oak Brook, IL. ...	27
Wellness	Refers to food, diet, or exercise	RT @usernameReady for playoff football? Enjoy the wild card games & stick to a healthy diet with these recipes: http://[link]	14
Personal	Refers to personal experiences relayed by users	I visited @username today for the first time. Cool space but where are the women? Let’s get the women who made the @username pledge going!	18