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As an internet application, Group-buying is a new darling of E-commerce. To the consensus of many, the integration of social networking and e-commerce will contribute significantly to the reliability of online transactions, and improve customers' satisfaction as well. This paper presents Group-buying Trust - a coherent adaptive trust model for quantifying and comparing the trustworthiness of group-buying websites based on a transaction-based feedback system and social network. The main feature of our model is the social factors are considered. In addition to the feedback users give after their transactions with group-buying websites, we incorporate the credibility of the feedback source.