Any Object that exists only within some communication Event, in which at least one PhysicalObject participates in. In other words, all objects that have been or are created in the process of social communication: for the sake of communication (InformationObject), for incorporating new individuals (SocialAgent, Place), for contextualizing or intepreting existing entities (Description, Concept), or for collecting existing entities (Collection). Being dependent on communication, all social objects need to be expressed by some information object (information objects are self-expressing).