Here’s a definition that makes me dance:
the ethnography of journalists offers more fine-grained insights, on the one hand, into the mediating practices of representation and circulation without which there would be no media, and, on the other, into the institutional and professional schemes and technical instrumentaria that wreathe, suffuse, and to some extent set conditions of possibility on the mediating labors of journalism.
(Boyer & Hannerz 2006: 8)
Boyer, Dominic and Hannerz, Ulf (2006). Introduction: Worlds of journalism. Ethnography 7 (1): 5-17.
PS: for anyone with an interest in media and in ways of thinking about media, I wholeheartedly recommend Dominic Boyer’s Understanding Media: A popular philosophy.