This article examines the social-commercial activity of microcommerce (wei shang), which has become popular on Weixin (WeChat), one of the most popular messenger applications/social app installed on smartphones in China. By drawing on the notion of platform affordances and data collected from mixed methods centered on the analysis of primary and secondary data, we contend that microcommerce embodies Weixin’s structural (political economy) and cultural (social lives and norms) qualities in China. While microcommerce might have emerged from Weixin’s ecosystem, which is defined by corporate interest and state’s regulatory power, the practice of microcommerce is embedded within the traditional Chinese notion of shuren guanxi (familiar, non-stranger social relational) networks. This article puts forward a sociomaterial approach as a possible conceptual complement to the existing political economy approach of platform studies to call for greater attention to the intersection and interaction between the structural arrangements and social conditions of platform media.