PurposeThe purpose of this paper is to develop and empirically test a research model examining the impact of five social media marketing (SMM) elements–entertainment, customization, interactivity, electronic-word-of-mouth (eWOM) and trendiness–on consumers' intent to participate in value co-creation and on consumer–brand engagement (CBE) and perceived brand value in turn.Design/methodology/approachThe research model is tested for wearable healthcare technology, a smart-technology product. Data were collected in China from 294 users using a self-administered online survey. Data analysis uses partial least squares – structural equation modelling (PLS-SEM).FindingsEntertainment, customization and eWOM are the key predictors in driving consumers' value co-creation intention, thereby strengthening the value co-creation process, CBE and perceived brand value. In contrast with previous studies in the area of value co-creation and CBE, the impact of interactivity and trendiness on value co-creation intention is non-significant.Research limitations/implicationsThe research contributes to the literature by providing an understanding of how to use SMM dimensions to drive consumers' value co-creation intention for smart-technology products, such as healthcare-wearable technology. However, this study is cross-sectional in nature and its focus is solely on wearable healthcare technology in China. To enhance the generalizability of the findings, future research might consider a longitudinal design and include comparisons between countries with diverse cultures, along with other types of smart-technology products.Practical implicationsThe findings provide guidance for marketers to enhance CBE and perceived brand value by strengthening consumers' value co-creation intention, using SMM with entertaining and customized content and encouraging positive referrals on social-media platforms.Originality/valueScholarly attention on the importance of SMM in strengthening consumers' value co-creation intention and CBE is limited, and the question of which SMM elements are effective in driving value co-creation and its link to perceived brand value has not been examined. This paper contributes to the marketing literature by developing and empirically testing a research model, revealing entertainment, customization and eWOM as key SMM elements driving value co-creation intention and CBE for a smart-technology product in China.