1. In a server, a method of rating a list of resource links indexed by a plurality of categories, the resource links pointing to resources on a network, the method comprising: receiving data representing user interactions by a plurality of users with resource links from a plurality of clients over the network, the resource links being associated with the plurality of categories; generating a usage table that includes a plurality of usage entries, wherein each of the plurality of usage entries includes a set of activity parameters that identifies a usage activity by one of the plurality of users of one of the resource links; calculating a user rating for each of the plurality of users in each of the plurality of categories using the usage table, wherein the rating for the user in said category is calculated as a function of the plurality of categories of the usage entries for the user within said category divided by the total number of usage entries within said category for the user; and rating the resource links using the calculated user ratings.