social network
Refers to the web of social relationships and connections among people, often in a sociological or general context.
See also: 社会的ネットワーク
The study of social networks is an important field in sociology.
social networking service; SNS
Specifically refers to online platforms like Facebook, Twitter, etc. Often abbreviated as SNS in Japanese.
See also: ＳＮＳ
A new social networking service is popular among young people.