1. A computer-implemented method, comprising: maintaining, by a social networking system, a plurality of personas describing entities represented in the social networking system, each persona associated with a page provided by the social networking system; determining a plurality of persona clusters, each persona cluster including a set of the plurality of personas that purport to be the same entity based on content in the page associated with each persona; and for each of one or more of the persona clusters: determining a plurality of interactions with the personas in the cluster initiated by other entities in the social networking system, determining a measure of authenticity for each of the personas based on the determined interactions for the persona, and selecting an authentic persona of the plurality of personas in the persona cluster based on the determined measures of authenticity. storing information describing the selected authentic persona for the persona clusters.