“…Heo & Toomey, 2016;Jadin, Gnambs, & Batinic, 2013;Lai & Chen, 2014;Wei, Lin, Chen, An, & Yeh, 2015). Prior studies have focused on constructs associated with social capital theory (Chumg, Cooke, Fry, & Hung, 2015;Wasko & Faraj, 2005), social cognitive theory (Fang & Chiu, 2010), resource exchange theory (Chan & Li, 2010), uses and gratification theory (Chen, Yang, & Tang, 2013), and organizational citizenship behaviors (Chiu, Hsu, & Wang, 2006) and self-efficacy (Jin, Zhou, Lee, & Cheung, 2013;Papadopoulos, Stamati, & Nopparuch, 2013). In the travel service sector, Li and Liu (2014) have recently revealed that travelers' perceived usefulness of e-service has a positive effect on word-of-mouth knowledge sharing.…”