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In this paper the authors aim to review the state-of-the-art literature on online review systems and their impacts on consumer behavior and retailers' performance with the aim of identifying research gaps related to different design features of review systems and developing future research agenda.

The authors conducted a systematic review based on PRISMA 2020 protocol, focusing on studies published in the domains of retailing and marketing. This procedure resulted in 48 selected papers investigating the design features of retailer online review systems.

The authors identify eight design features that are controllable by retailers in an online review system. The design features have been researched independently in previous literature, with some features receiving more attention. Most selected studies focus on the design features adapted metrics and review presentations, while other features are generally neglected (e.g. rating dimensions). Previous literature argues that design features affect consumer behaviors and retailers' performance. However, the interactions among the features are still neglected in the literature, creating a relevant gap for future research.

This paper distinguishes between different types of retailer online review systems based on how they are implemented. The authors summarize the state-of-the-art of relevant literature on design features of online review systems and their effects on consumer- and retailer-related outcome variables. This systematic literature review distinguishes between online reviews provided on websites controlled by retailers (internal systems) and third-party websites (external systems).

Snacking has been characterized as normatively unrestricted and identified as one of the main causes of adolescent obesity. The purpose of this paper is not to question the relation between obesity and snacking, but to ask to which extent adolescent snacking is socially unrestricted and to explore adolescent perceptions of the potential conventions and dilemmas involved in snacking.

Referring to previous research in food choice dilemmas and conventions, the paper starts out by discussing potential implications for adolescent snacking in different social contexts. Following this, the design, implementation and results of three focus groups, aiming at an exploration of adolescent snacking perceptions is described.

By identifying two distinct forms of adolescent snacking, i.e. “in‐between meals” and “fun snacks”, the results of the focus groups falsify the perception of snacking as socially unrestricted and offer some interesting insights into the conventions, personal dilemmas and intergenerational conflicts which characterize adolescent snacking.

The classification of snacking as unrestricted of social norms is both unwarranted and counterproductive to the understanding – and subsequently the mitigation – of the relation between snacking and obesity.

Apart from falsifying the classification of snacking as unrestricted of social norms, the study contributes by devising a focus group design for elicitation of social norms and dilemmas. Recognizing that the study is just a first step towards a comprehensive understanding of adolescent snacking and that facilitation of healthier snacking behaviors requires such an understanding, recommendations for further research are given.