Whilst some semioticians have retained a structuralist concern with formal systems (mainly focusing on detailed studies of narrative, film and television editing and so on), many have become more concerned with social semiotics. A key concern of social semioticians is with 'signifying practices' in specific socio-cultural contexts. Social semioticians acknowledge that not all realities are equal, and are interested in 'sites of struggle' in which realities are contested. The roots of social semiotics can be traced to the early theorists. Saussure himself wrote of semiotics as 'a science that studies the life of signs within society'.