A method and system for displaying interest space user communities. A method may include detecting a request to access a given online content source, where the request is generated on behalf of a given user, where the given online content source is one of a number of online content sources included within an interest space, and where the interest space is identified dependent upon indications of user navigation activity among the online content sources. The method may further include displaying to the given user a representation of the interest space in response to detecting the request, where the representation includes respective indications of at least a subset of the content sources included within the interest space, and for a given content source within the subset, displaying to the given user respective indications of users on whose behalf a respective previously-generated request to access the given content source has been detected.