A method and system for determining interest levels of online content navigation paths. A method may include determining each of a plurality of navigation paths among a plurality of online content sources, and for each of the navigation paths, determining a corresponding path weight, where a given corresponding path weight is indicative of user activity along a corresponding navigation path. The method may further include identifying a particular aggregate path within the online content sources, where the particular path includes some of the navigation paths, where an aggregate path weight corresponding to the particular path is dependent upon the path weights corresponding to the navigation paths included in the particular path, and where the aggregate path weight satisfies an optimization criterion relative to other aggregate paths. A given navigation path included in the particular aggregate path may correspond to a possible user traversal from a first to a second online content source.