Purpose-The purpose of this paper is to understand the Asian millennial behavior regarding the use of social media when they are traveling based on a systematic literature review, and to suggest strategies for tourism business in dealing with the millennial generation, which differs from the previous segment. Design/method/approach-A volume of 25 peer-reviewed journal articles were collected from two major databases. The current study was designed using content analysis to explore the millennial behavior in pre, during, and post-travel.Finding-The characteristics of millennials using their social media drive some behavior based on before, during, and post-travel. These behaviors are reshaping the tourism and hospitality industries. Originality/value-The study provides a new understanding of millennial travelers, their characteristics, and travel behaviors in the realm of social media.