In recent years, the marketing literature has given considerable attention to the concept of online consumer misbehaviour. However, this increased interest has resulted in a significant accumulation of knowledge, leading to fragmentation and confusion in the field. This situation has serious implications for both researchers and practitioners, as it impedes the development of a coherent and unified understanding of the field. To address this issue, this paper presents a systematic review aimed at consolidating and organizing the available research on online consumer misbehaviour. The paper provides a conceptualization and operationalization of the concept of OCM. Additionally, the paper identifies and discusses the existing theories used in the field of OCM research.

The purpose of this research was to examine simultaneously health halo and health horn effects across two fast food restaurant brands that have healthful or unhealthful images (i.e., McDonald's and Subway). Specifically, we investigated the moderating effects of nutrition information disclosure and dietary restraint on behavioral intention of four menus from the two brands. Two menus from the McDonald’s and two menus from the Subway, respectively, had been selected as stimuli, and each menu represented health halo confirmation (the Roast-Chicken sandwich) / disconfirmation (the Italian-Spicy sandwich), and health horn confirmation (the Big Mac burger) / disconfirmation (the McSpicy-Cajun burger), respectively. This study employed a mixed factorial design: 2 (nutrition information: present vs. absent) X 2 (dietary restraint: restrained eater vs. unrestrained eater) X 4 (menu type: a health halo or a health horn (for the Subway and the McDonald’s with objective healthfulness). The survey was conducted on October 11- 17, 2016, by a research company, Macromill EMBRAIN in Korea, which possessed more than 1 million panel members. Cell sizes were 149 and 146 for the between-subjects factor. Participants were randomly assigned to one of the nutrition information disclosure experimental conditions (either present or absent) and presented with all four menus. The results showed that the behavioral intentions of all three menus, except health horn disconfirmation menu, were decreased. In particular, the effect size of health halo disconfirmation menu (decrease in behavioral intention) was the greatest. There was no difference in the behavioral intention of four menus between the restrained eater and unrestrained eater. Thus, brands positioned as healthy should well manage the expectation levels of their customers. A brand positioned as healthy, such as the Subway, has to manage the health expectation of its customer not get too high, or the brand has to continuously strive to satisfy its client's expectations. A brand positioned as unhealthy (eg, McDonald’s) needs to actively develop low-calorie menus, healthy menus or similar side dishes. Although indulgent menus would account for the majority of the revenue, existence of healthy menus / side dishes would lessen the guilty feelings of the customers of the restaurant and the brand. This is the first study which identified both the health halo effect and the health horn effect on restaurant brand image. The results of this study confirm the need to provide nutrition information on dining out menus and would help consumers choose healthy menus.