26. Physical computer storage that stores executable code that instructs a computer system to perform a method that comprises: storing user activity data associated with each of a plurality of users of an interactive system that provides access to a data repository of information regarding items, said user activity data reflecting user-generated events associated with particular items represented in said data repository; identifying, among the plurality of users, a subset of users whose email addresses are associated with a particular organization; analyzing the user activity data associated with the plurality of users, including the subset of users, to identify, among said items represented in the data repository, a set of items that have experienced significantly higher levels of user activity among the subset of users than among the plurality of users; and storing, in computer storage, association data that associates the organization with the identified set of items.
26. Physical computer storage that stores executable code that instructs a computer system to perform a method that comprises: storing user activity data associated with each of a plurality of users of an interactive system that provides access to a data repository of information regarding items, said user activity data reflecting user-generated events associated with particular items represented in said data repository; identifying, among the plurality of users, a subset of users whose email addresses are associated with a particular organization; analyzing the user activity data associated with the plurality of users, including the subset of users, to identify, among said items represented in the data repository, a set of items that have experienced significantly higher levels of user activity among the subset of users than among the plurality of users; and storing, in computer storage, association data that associates the organization with the identified set of items. 27. The physical computer storage of claim 26 , wherein the executable code additionally directs the computer system to use said association data to expose, to users of the interactive system, an association between the organization and items in said set.