In an exemplary method, at least one computing device 1) stores a plurality of content instances associated with a plurality of user profiles, 2) determines, based on a predefined relevance heuristic, a relevance between a user profile and each of the other user profiles included in the plurality of user profiles, 3) prioritizes, based on the determined relevance between the user profile and each of the other user profiles, the plurality of content instances relative to one another, and 4) provides, for display, data representative of the prioritized plurality of content instances.