In general, the subject matter described in this specification can be embodied in methods, systems, and program products for receiving, at a server system of a social network and from a telephone service provider, information identifying members of a preferred calling group for a first user that is associated with the telephone provider. The sever system of the social network identifies the first user as a member of the social network. The server system of the social network identifies one or more of the members of the preferred calling group as being one or more members of the social network. The server system of the social network automatically defines a social network group that includes the one or more members of the preferred calling group who are members of the social network.