## 1 Introduction  
By enabling people to access to the Internet anytime and anywhere, the development of information and communication technology (ICT) has produced many changes in society [1]. Among ICTs, social network services (SNSs) have become part of everyday life by expanding people's social networks on smart devices, allowing information to be shared easily and quickly, and facilitating communication with multiple people in real time [2]. An SNS is defined as a web-based service that allows people to form relationships, network, and share information and interests [3]. In addition, SNS users are free to create, distribute, and consume content through SNSs. Recently, SNSs have begun developing as convergent platforms for various fields and technologies, such as online communication, advertising, shopping, and business. However, SNS use is not always beneficial for individuals or society. As SNS use has increased, its negative consequences have caused confusion about appropriate SNS use as well as the phenomenon of SNS avoidance. For instance, as the size of one's network grows, the number of user interactions increases. Excessive interaction can cause SNS users to feel psychologically burdened or physically fatigued [4]. Furthermore, users may reduce their SNS use or consider disabling their accounts. This is related to the bilateral nature of information technology (IT), where the development of ICT provides the benefits of convenience and abundance as well as negative consequences such as anxiety, frustration, addiction, and stress. In other words, SNSs may instill in users both positive expectations about their potential benefits and anxiety about their dysfunctional features. Activity on SNSs consists of uploading profile information, making daily updates, sharing interests, establishing social relationships with others, and sharing and communicating information and opinions with other users [5]. As social connections expand and communication becomes more frequent through these processes, users must devote more time and effort to SNS activities, which can lead to a sense of psychological burden and fatigue. People can also experience unintentional information leaks or privacy violations, as well as stress stemming from exposure to a wealth of irrelevant information. Notwithstanding the individual stresses induced by SNSs, previous studies [5; 6] predicting SNS user behaviors have mainly adopted positive perspectives. Furthermore, research on the post-acceptance behavior of SNS users has predicted a persistent intention to use from a positive point of view [7; 8]. However, the adverse effects of SNS have become increasingly apparent throughout society, highlighting the need for investigations of SNS technology-related stress and its behavioral impacts. Among existing studies investigating the negative aspects of SNSs, several considering the duality of IT have examined negative aspects of IT use, focusing on concepts such as fatigue and technostress [9; 10]; others e.g., [11; 12] have mainly focused on privacy violations and user addiction. As the number of SNS users has increased, users have begun experiencing SNS fatigue and increasing levels of SNS-related stress. Researchers have yet to address the negative effects of SNSs by conducting in-depth examinations of user fatigue on existing SNSs. From the stressor-stress-outcome (SSO) perspective, few studies have investigated the social science phenomenon of living disorder, referring to the extent to which users believe that SNS fatigue causes discomfort in everyday life, such as at work and in learning and decreases in SNS use because of SNS fatigue that focus on both SNS and user characteristics, which are regarded as crucial components for explaining individual behaviors in the context of many technologies and services [13]. Therefore, understanding the true nature of SNSs from an SSO-informed social point of view first requires careful examination of the negative aspects of SNSs.