The majority of Americans turn to the Internet every day, seeking information on a variety of topics (Horrigan, 2016; Purcell, Brenner, & Rainie, 2012). While the abundance of information that is available online provides many opportunities and discoveries for everyday users, it also presents unprecedented challenges when it comes to considering and evaluating the credibility of information people encounter (Sundar, 2008). Although a strong foundation of research regarding online credibility assessment exists, it is crucial that scholarship continues to refine its understanding of how users with greater and lesser know-how assess the credibility of online information in light of the ever-changing digital landscape. This is particularly imperative in the domain of health information, given that so many turn to the Internet for critical information regarding medical decision making (Horrigan, 2016; Fox & Duggan, 2013).
In this study, we explore how users differ in their ability to assess the credibility of online health information. With the wealth of information available online, what are the most common strategies that people use to assess health-information credibility and what are the most informed strategies people employ? While much related research tends to set boundaries on the types of online sources users may consult (e.g., specific search engines, social question-asking sites, and other particular sites), our research design is much more encompassing in that it did not impose a priori constraints on where participants could search for answers to the questions we posed to them. Accordingly, we can address questions such as whether the strategies people use on a website differ from those they use while viewing a search engineās results page. Taking on Metzgerās (2007) call for āa greater variety of research methods, on a greater variety of Internet users, performing a greater variety of search tasks than has been done to dateā (p. 2086), this unique mixed-methods study on a diverse group of adults adds important insights into how credibility assessment is currently understood.
Credibility Assessment Online
Scholars have long studied how people evaluate the credibility or ābelievabilityā of information both in online and offline contexts (Tseng & Fogg, 1999). Credibility assessment ārefers to any attempt to ascertain truthfulnessā (Yuille, 1989, p. VII). Such cognitive evaluations are critical because they influence how people come to understand and use the information they encounter (Hovland & Weiss, 1951; McCroskey & Young, 1981; Menchen-Trevino & Hargittai, 2011). While credibility assessment has long been discussed as a necessary skill by educators and researchers (Hargittai, 2007; Jenkins, Clinton, Purushotma, Robison, & Weigel, 2006; Metzger, 2005), the vast amount of information on the web combined with the ability for anyone to add to the existing material has made credibility evaluation online even more complex and challenging than in traditionally mediated contexts (Sundar, 2008).
Scholars have proposed several different theoretical models to describe how people make sense of information online (Fogg, 2003; Fritch & Cromwell, 2001; Jessen & Jorgensen, 2012; Lucassen & Schraagen, 2012; Metzger, Flanagin, & Medders, 2010; Wathen & Burkell, 2002). For example, Prominence-Interpretation Theory (Fogg, 2003; Wathen & Burkell, 2002) suggests that when people approach a site, they notice and begin to judge its āprominentā elements, such as its images. They iteratively assess a variety of features until they form an āoverall assessment of credibilityā (Fogg, 2003, p. 722). Wathen and Burkell (2002) proposed that when people get to a site, they first assess the siteās āsurface credibilityā based on factors like the siteās appearance, usability, and organization, and then they move on to evaluate the siteās message based on factors like its source and relevance.
However, additional research suggests that credibility assessment can be much less systematic. Assessing an abundance of information often conflicts with usersā lack of skills and/or time (Klawitter & Hargittai, in press; Taraborelli, 2008), therefore many people rely on cognitive heuristics, āshort cuts, rules-of-thumb, or guidelines that reduce cognitive load during information processing and decision-makingā (Metzger et al., 2010, p. 417). This is perhaps why much research focuses on heuristic cues, such as a siteās layout and design (Flanagin & Metzger, 2007; Fogg et al., 2003; Gasser, Cortesi, Malik, & Lee, 2012; Hove, Paek, & Isaacson, 2011; Sundar, 2008; Tombros, Ruthven, & Jose, 2005; Wathen & Burkell, 2002), or brand or sponsor (Hargittai, Fullerton, Menchen-Trevino, & Thomas, 2010; Hove et al., 2011; Westerwick, 2013). Additionally, as web pages increasingly incorporate user-generated features, such as comments and reviews, research suggests that users rely on social feedback for their evaluations (Flanagin & Metzger, 2013; Flanagin, Metzger, Pure, & Markov, 2011; Jessen & Jorgensen, 2012; Metzger & Flanagin, 2011; Metzger et al., 2010; Sundar, 2008; Walther, Liang, Ganster, Wohn, & Emington, 2012), adding a layer of complexity.
In order to control for context, which may impact the credibility-Āassessment process (Eastin, 2001; Flanagin & Metzger, 2000; OāKeefe, 2002), this study focuses on the health domain. The Internet has played an important role in peopleās everyday health queries (Cotten & Gupta, 2004; Fox & Fallows, 2003; Fox & Rainie, 2002; Horrigan, 2016; van Deursen, 2012), and is sometimes an even more important source of information than traditional sources, including medical professionals (Dobransky & Hargittai, 2011; Escoffery et al., 2005; Percheski & Hargittai, 2011). People actively search for answers to health-related queries. Information they retrieve can have significant consequences. For example, a British newspaper reported that one family tried to treat a gunshot wound using information from WebMD.com (Daily Mail Reporter, 2013). The mother waited seven hours before seeking medical attention for her son, choosing to rely on online sources rather than immediately seeking professional help. As a Pew Research Center report noted:
a great many health seekers say the resources they find on the Web have a direct effect on the dec...