social network
US /ˈsoʊʃl ˌnetwɜːrk/
UK /ˈsoʊʃl ˌnetwɜːrk/

1.
a network of social interactions and personal relationships
:
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Her extensive social network helped her find a new job quickly.
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Building a strong social network is important for career advancement.
2.
an online platform that allows users to create public profiles and interact with other users
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Facebook is a popular social network.
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Many people use social networks to stay connected with friends and family.