The era of social media networks has created significant opportunities for business relationship development yet there exists a paucity of research in this area. To address this, this paper identifies four key tensions within the current literature: relational versus transactional exchanges, emergent versus strategic social media network development, the pace of social media network formation versus the development of trust, and the notions of sharing and reciprocity versus competitive advantage. This study draws on the principles of netnography, incorporating data from 554 LinkedIn group interactions and 12 interviews with professionals in one global industry to provide insight into business relationship development stemming from one social media network. Significant contributions to theoretical and practical knowledge are made through the recognition of tensions in the literature, the application of the notion of Granovetter's ties to a contemporary context and the novel use of netnography. Furthermore, the resultant model conceptualises the use of social media networking in building networks and relationships which lead to new business and enhance business performance. •We conceptualise the use of social media networks for business.•We identify key tensions in the business relationship and social media network literature.•A model is created of performance enhancement via social media networks.•An illustration of the wine industry's use of business social media networks•Business social media networks do create business performance enhancement.