Media studies is a discipline and field of study that deals with the content, history and effects of various media in particular, the mass media. Media studies may draw on traditions from both the social sciences and the humanities, but mostly from its core disciplines of mass communication, communication, communication sciences and communication studies. Researchers may also develop and employ theories and methods from disciplines including cultural studies, rhetoric (including digital rhetoric), philosophy, literary theory, psychology, political science, political economy, economics, sociology, anthropology, social theory, art history and criticism, film theory, feminist theory, and information theory. McLuhans aphorism the medium is the message was not restricted to mass media, and for him all human artifacts and technologies are media. A medium is anything that mediates our interaction with the world or other humans. Given this perspective of McLuhans media theory is not restricted to just media of communications but all forms of technology. Another insight of McLuhans relevant to media theory is that media and their users form an ecosystem and the study of this ecosystem is known as media ecology.