A unique system and method that facilitates trust-based interaction within an online social marketplace is provided. The system and method involve allowing users of the marketplace to selectively interact with one another according to a trustworthiness factor. Users can be deemed trustworthy depending on which email groups they belong to with respect to one another. For example, sellers can limit who can view their listings and when based on trust levels associated with their social groups, communities, or networks. Notifications of new or modified listings can also be sent to potentially interested users based on the users' trust levels. A ratings system can be employed as well to facilitate boosting or diminishing a user's or group's trust level. The social marketplace can include such activities as a listing service to buy, sell, or give items to others, dating and other personal listings, and job searching.