Someone who only drinks alcohol when with acquaintances who are drinking.

Someone who only smokes with other people who are smoking.

(uncountable) Shared or interactive trade in financial goods and services, through primarily online means. / (uncountable) Online financial trading conducted by means of a social network.

(idiomatic) The hierarchy of a society.

plural of social insect

plural of social network

plural of social democrat

(philosophy, politics) An implicit agreement or contract among members of a society governing such matters as submission of individuals to rule of law and acceptable conduct.

(politics, economics) a political and economic philosophy originated by C. H. Douglas which envisages an "aristocracy of producers, serving and accredited by a democracy of consumers".

plural of social profile