1. A method comprising: identifying a plurality of connections of a user, each connection comprising another user of a social networking system with whom the user has established a relationship in the social networking system; determining a plurality of measures of affinity for the user's connections, each measure of affinity determined based at least in part on an association between two or more of the connections; grouping at least a subset of the connections into one or more clusters, wherein the connections are assigned to a cluster based on the determined measures of affinity; and outputting a result of the grouping comprising an identification of the clusters and which of the user's connections have been assigned to the clusters.