1. A method, comprising: accessing activity information associated with a former subscriber of a social network service; comparing the accessed activity information to activity information associated with subscribers of the social network service; identifying one or more differences between the activity information associated with the former subscriber of the social network service and the activity information associated with the subscribers of the social network service; and performing an action based on the identified one or more differences between the activity information associated with the former subscriber of the social network service and the activity information associated with the subscribers of the social network service.