ABSTRACT
Early in the COVID-19 pandemic, social media platform Instagram surged in popularity as a source of health information. Both the World Health Organization (WHO) and the Centers for Disease Control and Prevention (CDC) leveraged Instagram accounts to publicly distribute COVID-related information. The current study investigated whether WHO and CDC messaging strategies on Instagram adhered to best practices defined by two theoretical frameworks: the extended parallel process model and crisis and emergency risk communication. We conducted a quantitative content analysis of COVID-related posts (n = 726) published between January-December 2020 to determine how both agencies (1) communicated the threat of the pandemic (e.g. susceptibility and severity of negative COVID-19 consequences); (2) appealed to self-, response, and collective efficacy; (3) incorporated cues to action (e.g. preventive behaviors, information seeking); and (4) leveraged credibility cues (e.g. scientific evidence, experts). Results showed threat information was limited, whereas efficacy appeals and cues to action were abundant. The CDC relied more heavily on depictions of self- and response efficacy, whereas the WHO appealed more frequently than the CDC to collective efficacy. Neither visually modeled behaviors nor leveraged scientific evidence or experts with great frequency. Implications for future research and official communication efforts via social media are discussed.