A method for providing recommendation information from a network application service is disclosed and includes receiving, by a server, user activity data relating to a first data object of a plurality of data objects in a network application service, and storing the user activity data in a structured storage model comprising a plurality of nodes representing a plurality of items including the first data object, and at least one edge representing user activity data relating to the plurality of items. When a recommendation search criteria relating to the first object is received, recommendation information corresponding to the recommendation search criteria is retrieved and transmitted. The recommendation information is based on at least one inference determined from the structured storage model.