This article provides a comprehensive literature review about the post-adoption stage of social network sites (SNS) usage with the special focus on habitual use and terminating stages. The extant research has examined this topic mainly from two perspectives: namely, intentional and habitual. Findings from each of these two perspectives are synthesized and used to build a process model to better understand how different intentions and behaviors of users manifest in different stages of SNS post-adoption phase. The process model suggests that disturbances such as technical glitches and privacy leaks trigger users’ awareness of the ‘dark sides’ of habitual SNS use. In addition, the awareness of negative impacts of addictive use, which are perceived as threats, motivates people to switch from or quit SNS. This paper contributes to SNS research by synthesizing fragmented theoretical explanations and providing a visual tool that helps researchers to develop a deeper understanding of the dynamics in the SNS post-adoption phase. Practitioners will gain insights into how to retain existing users and better manage processes related to users who wish to quit.