28 Int. J. Electronic Marketing and Retailing, Vol. 6, No. 1, 2014 Copyright © 2014 Inderscience Enterprises Ltd. Examining online channel selection behaviour among social media shoppers: a PLS analysis Sajad Rezaei International Business School (IBS), Universiti Teknologi Malaysia (UTM), Jalan Semarak 54100 Kuala Lumpur, Malaysia Email: mmg.sajad@gmail.com *Corresponding author Wan Khairuzzaman Wan Ismail College of Business Administration, Jazan University, Kingdom of Saudi Arabia and International Business School (IBS), Universiti Teknologi Malaysia (UTM), Jalan Semarak 54100 Kuala Lumpur, Malaysia Email: mwkhair@jcba.edu.sa Abstract: Online social media shopper’s channel selection behaviour have been neglected despite its significant effect on purchase decision in both offline and online markets. The purpose of this study is to examine the influence of transactive memory system (TMS) factors (specialisation, credibility and coordination), knowledge sharing (KS) and communication quality on online social media channel selection for shopping activities. Structural equation modelling (SEM) was performed using partial least squares (PLS) analysis to examine measurement model and structural model for reflective constructs. A total of 336 online questionnaires were collected from users of collaborative projects, social networking sites, blogs, content communities, virtual game worlds, and virtual social worlds. Our results reveal that TMS factors, KS and communication quality positively influence online channel selection. In addition, specialisation, credibility and coordination statistically contribute to TMS as a second order construct. This study extends the social exchange theory (SET) and TMS model in B2C retail context rather than B2B. Practical implications, limitations and directions for future research are discussed. Keywords: online channel selection; transactive memory system; TMS; knowledge sharing; KS; communication quality; social shopper groups; online retailing. Reference to this paper should be made as follows: Rezaei, S. and Ismail, W.K.W. (2014) ‘Examining online channel selection behaviour among social media shoppers: a PLS analysis’, Int. J. Electronic Marketing and Retailing, Vol. 6, No. 1, pp.28–51. Biographical notes: Sajad Rezaei is a PhD candidate at International Business School (IBS), Universiti Teknologi Malaysia (UTM). He holds a Bachelor of Business Administration (BBA) from Azad University of Iran and Master of