Marketplaces have provided a meeting place for communities to socialise, exchange information and transact business for many centuries. It is perhaps a natural progression that the inclusion of social network facilities should be an intrinsic part of e-marketplace development. This exploratory study examines the concept of designing social features into an e-marketplace by considering the needs of online community members. Using TradeMe, a New Zealand horizontal intermediary e-marketplace, as an illustrative case study it was found that the use of an online community to encourage information flow, reciprocity and trust has resulted in a vibrant, successful business model. Further research is required to investigate the viability of the community model beyond the case illustrated.