social medianoun [ U or plural ]
uk/ˌsəʊ.ʃəl ˈmiː.di.ə/us/ˌsoʊ.ʃəl ˈmiː.di.ə/websites and computer programs that allow people to communicate and share information on the internet using a computer or mobile phone:
Companies are increasingly making use of social media in order to market their goods.