Mobile instant messaging (MIM) is a kind of mobile applications that enables users to contact with others instantly on various mobile terminals without time and geographical restrictions. In addition to its basic functionality for social communication, MIM is further served as an integrated platform that incorporates a variety of additional services (e.g., social networking, e-commerce, corporate advertising, e-payment, and social games), demonstrating great opportunities for mobile business (Oghuma et al., 2016, Yoon et al., 2015). With the increasing usage of various MIMs such as WhatsApp, WeChat, and Line throughout the world, users' adoption behavior of MIM has drawn more and more attention from IS researchers in recently years (Sun et al., 2015, Wang and Sun, 2016, Zhan et al., 2016).