Abstract: A method, apparatus, system, and computer program product for processing a query received through a network. A computer system identifies a topic in the query. The computer system identifies a set of friends of a user from a set of social media networks in which the set of the friends have an expertise in the topic identified in the query. The computer system ranks the set of the friends based on a level of the expertise of the set of the friends for the topic and an availability of the set of the friends to form a ranked set of the friends. The computer system returns results that contain the ranked set of the friends for the topic.