the present invention discloses a communication system including a communications network , a multiplicity of communications terminals which are connectable to the communications network and which can be employed by users to communicate via the communications network , the user not necessarily being identified with a given communications terminal , apparatus for monitoring whether or not a user is connected to the communications network irrespective of which of the multiplicity of communications terminals that user is employing , and apparatus for annunciating to a seeking user , currently connected to the communications network via any of the multiplicity of communications terminals , network connection status information relating to other users who are in a set of sought users , which set is definable by the seeking user , and for providing the seeking user connection address information relating to those sought users who are currently connected to the communications network .