• Joy L Lee, Matthew DeCamp, Mark Dredze, Margaret S Chisolm, and Zackary D Berger.
• Johns Hopkins Bloomberg School of Public Health, Department of Health Policy & Management, Baltimore, MD, United States. jllee@jhu.edu.
• J. Med. Internet Res. 2014 Jan 1;16(10):e237.

BackgroundTwitter is home to many health professionals who send messages about a variety of health-related topics. Amid concerns about physicians posting inappropriate content online, more in-depth knowledge about these messages is needed to understand health professionals' behavior on Twitter.ObjectiveOur goal was to characterize the content of Twitter messages, specifically focusing on health professionals and their tweets relating to health.MethodsWe performed an in-depth content analysis of 700 tweets. Qualitative content analysis was conducted on tweets by health users on Twitter. The primary objective was to describe the general type of content (ie, health-related versus non-health related) on Twitter authored by health professionals and further to describe health-related tweets on the basis of the type of statement made. Specific attention was given to whether a tweet was personal (as opposed to professional) or made a claim that users would expect to be supported by some level of medical evidence (ie, a "testable" claim). A secondary objective was to compare content types among different users, including patients, physicians, nurses, health care organizations, and others.ResultsHealth-related users are posting a wide range of content on Twitter. Among health-related tweets, 53.2% (184/346) contained a testable claim. Of health-related tweets by providers, 17.6% (61/346) were personal in nature; 61% (59/96) made testable statements. While organizations and businesses use Twitter to promote their services and products, patient advocates are using this tool to share their personal experiences with health.ConclusionsTwitter users in health-related fields tweet about both testable claims and personal experiences. Future work should assess the relationship between testable tweets and the actual level of evidence supporting them, including how Twitter users-especially patients-interpret the content of tweets posted by health providers.

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