This is the 6069th most frequent Russian word.
соцсеть
Social network.
Used as a singular noun to refer to an online social networking platform.
Я зарегистрировался в новой соцсети на прошлой неделе.
I signed up for a new social network last week.
Used as a plural noun representing multiple social networking platforms generally.
Соцсети играют важную роль в современном обществе.
Social networks play an important role in modern society.
Used in the prepositional case plural form referring to the platforms as locations of activity.