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English definition of “social network”

social network

noun [C]    
a website or computer program that allows people to communicate and share information on the internet using a computer or mobile phone: We teach children how to deal with cyberbullying and the safe use of chat rooms and social networks. the different groups of people that you know: Students graduating from high school have social networks they've been building for twelve years.
(Definition of social network noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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