1. A computer-implemented method for computing an overall reputation score for a user profile of a default network computing system, the method comprising: receiving a request from a client device to provide an interface including a reference to the user profile of the default network computing system; retrieving, from the default network computing system, a plurality of user action counts, each user action count indicating how many times a particular action relating to the referenced user profile has occurred within the default network computing system; multiplying, through the default network computing system, each of the plurality of user action counts by one of a plurality of weighting factors to determine a plurality of products, each weighting factor corresponding to a particular user action count; summing, through the default network computing system, each product in the determined plurality of products to calculate an action count reputation score for the referenced user profile; identifying a default network comprising user profiles having at least one profile attribute in common with the referenced user profile, each profile attribute provided by a corresponding user for inclusion in a corresponding user profile; retrieving a connection reputation score determined from an aggregation of connected profile reputation scores determined for other user profiles in the identified default network and connected to the referenced user profile, a connected profile reputation score determined based at least in part on actions performed by a connected user profile with respect to a third user profile not connected to the referenced user profile; determining, through the default network computing system, the overall reputation score for the referenced user profile by adding the retrieved connection reputation score multiplied by a connection reputations weight to the referenced user profile's action count reputation score; storing, in the default network computing system, the overall user reputation score for the referenced user profile; and providing the requested interface for display by the client device, the interface comprising the overall user reputation score for the referenced user profile.