1. A method performed by data processing apparatus, the method comprising: receiving a query that specifies desired user data for user pages in a social networking system and desired performance data for the user pages in the social networking system, the desired performance data describing a desired performance of advertisements when the advertisements are displayed on the user pages in the social networking system; querying social networking system data for user pages in a social networking system responsive to the query, the querying including evaluating profiles of a given user page as against the query; and receiving a performance group from the social networking system data, the performance group identifying user pages of the social networking system responsive to the query and comprising performance data of the user pages responsive to the query, the performance data of each user page specifying an advertisement performance for advertisements when the advertisements are displayed on the user page, the identified user pages being user pages that have: a profile having data that matches the desired user data; and an advertisement performance that satisfies the desired performance of advertisements specified by the query.