A system and method of facilitating communication, via a telecommunications system, among people that may perceive each other's physical presence, but may not know each other's identity or contact information (e.g., telephone number, e-mail address, etc.). A user indicates a target (another user or another user's vehicle) by specifying values of various observable features that unambiguously describe the target within the constraints of the target's location. Communication between two users may be mediated, and may be wholly or partially suspended unless it is initiated by both parties.