Timothy M. Hale is the Associate Director of Product Development at Partners HealthCare, Connected Health Innovation (CHI) and an Instructor at Harvard Medical School, USA. Wen-Ying Sylvia Chou is a Program Director in the Health Communication and Informatics Research Branch (HCIRB) of the Behavioral Research Program (BRP) at the National Cancer Institute (NCI), USA. Shelia R. Cotten is MSU Foundation Professor in the Department of Media and Information at Michigan State University and the Director of the Sparrow/MSU Center for Innovation and Research, USA.Aneka Khilnani is a recent graduate from Santa Clara University with a BS in Public Health Science, where she graduated Summa Cum Laude.

• Introduction: Promises and Perils of eHealth; Timothy M. Hale, Wen-Ying Sylvia Chou, Shelia R. Cotten Chapter 1. "I Went Home to Google”: How Users Assess the Credibility of Online Health Information; Erin Klawitter and Eszter Hargittai Chapter 2. Trust in Health Information Sources and Channels, Then and Now: Evidence from the Health Information National Trends Survey (2005-2013); Chan L. Thai, Anna Gaysynsky, Angela Falisi, Wen-Ying Sylvia Chou, Kelly Blake, and Bradford W. Hesse Chapter 3. Health-Related Information Seeking among Deaf Adults: Findings from the 2017 Health Information National Trends Survey in American Sign Language (HINTS-ASL); Poorna Kushalnagar and Raja KushalnagarChapter 4. The Impact of Health Practitioners’ Use of Communication Technologies on Temporal Capital and Autonomy; Cynthia Wang Chapter 5. Tracking Health and Fitness: A Cultural Examination of Self Quantification, Biomedicalization and Gender; Amy A. Ross Chapter 6. The Third Digital Divide in the Health Domain: Is Internet Use for Health Purposes Associated with Health Benefits?; Efrat Neter, Esther Brainin, and Orna Baron-Epel Chapter 7. Who is Likely to Benefit Most from Online Cancer Support Communities? The Role of Personality Traits; Yuchen Ren and An Xiaojing Chapter 8. Positive Impacts of Online Health Information Seeking on Health Perceptions and the Mediational Relationship with Health Communication and Sense of Empowerment; Gül Seçkin, Susan Hughes, Cassie Hudson, David Laljer and Dale Yeatts Chapter 9. Developing a Graphic Text Messaging Intervention for Smoking Cessation Targeting First-Generation Chinese Immigrant Men: Insights from Focus Group Interviews; Emily B. Peterson, Xiaoquan Zhao, Xiaomei Cai and Kyeung Mi Oh Chapter 10. Using Social Media to Help Lesbian, Gay, and Bisexual Young Adults Quit Smoking: An In-depth Interview Study; Ashley Sanders-Jackson, Christopher Clemens and Kristen Wozniak

Contributors from medical fields and from communications and media explore the role and impact of the Internet and other technologies on health communications across a broad range of contexts. Among their topics are trust in health information sources and channels then and now: evidence from the Health Information National Trends Survey 2005-13, the impact of health practitioners' use of communication technologies on temporal capital and autonomy, the third digital divide in the health domain: whether Internet use for health purposes is associated with health benefits, who is likely to benefit most from online cancer support communities: the role of personality traits, and developing a graphic text messaging intervention for smoking cessation targeting first-generation Chinese immigrant men: insights from focus group interviews.