In one embodiment, a social networking system provides people look up service and establish anonymous communication session between users; creates contact association for future communication between users; and configures one or more privacy settings for users. The method may comprise receiving from an initiating user a request for information of a target user, determining location information associated with the initiating user, accessing one or more privacy settings of the target user to determine if the initiating user fulfills a requirement based on one or more social, spatiotemporal, geographic or temporal conditions associated with the target user and the location information associated with the initiating user, and in response to determining that the initiating user fulfills the requirement, providing the requested information of the target user to the initiating user.