PurposeThis study aims to integrate reviewers' and readers' discrepant perspectives on extremely negative reviews. Specifically, this study examines the relationship between negative emotion intensity levels and reviews helpfulness on two platforms: integrated websites and social networking sites (SNS) to emphasize the role of platform types on customers' purchase decisions. Design/methodology/approachThis research adopts a mixed-method approach of business intelligence approach and quasi-experimental design. Study 1 performed text mining and Welch's t-test to compare reviewers' negative emotion intensity levels on two platforms. Study 2 adopted a 2{*}2 factorial quasi-experimental design to examine how intense negative emotions impact the perceived reviews helpfulness on two platforms. A 3{*}2 factorial design in Study 3 also tested social tie strength's moderating effect between the intensity of negative emotions and review helpfulness. FindingsThe current study reveals that integrated website reviewers tend to express more extreme negative emotions than SNS reviewers. SNS and integrated website readers deem reviews that embed severe negative emotions as less helpful. The moderating role of social tie strength between extremely negative emotions on review helpfulness was insignificant in the study. Research limitations/implicationsThis study enriches the online review literature by comparing writers' and readers' perspectives on online reviews with extremely negative emotions across two online platform types: integrated websites and SNS. From the writers' perspective, this study highlights anonymity and the presence of an audience as essential factors that reviewers consider in selecting an online review platform to express themselves. This research also sheds light on how readers' perspectives on extremely negative reviews conflict with the presumptions of writers of extremely negative reviews on integrated websites by demonstrating that content embedding extremely negative emotions is less helpful regardless of platform type. Practical implicationsThis research provides online negative review management strategies to platform and hotel managers. The findings suggest hotel and review platform managers should consider adopting review alignment or monitoring systems based on negative emotions intensity levels since readers on both platforms perceive reviews embedding extremely negative emotions as less helpful. Additionally, hotel managers can progress promotions to guests who share online reviews on SNS since SNS reviewers are more likely to attenuate their extremely negative emotions when writing reviews. Originality/valueThis research innovatively provides a comprehensive overview of negative reviews' production and consumption process from reviewers' and readers' perspectives. This research also provides practitioners insight into the nature of two different platform types and the management of negative reviews on these platforms.