Clique according to Webster:

a narrow EXCLUSIVE circle or group of persons ; especially : one held together by common interests (popularity, as in high school), views, or purposes (as in, to exclude non-popular people)

I've never seen a "clique" here except MAYBE that group I walked in on the other day.

Clique according to Wikipedia:

A clique ('klik) is an informal and RESTRICTED social group formed by a number of people who share common interests - formal social groups are referred to as societies or organizations. Cliques are most notably found amongst groups of TEENAGERS, primarily in high schools and colleges, but also in other similar environments. In a general manner, cliques are more prominent amongst females.

Cliques at times have complex structures, and characteristics tend to differ between one another. However, one characteristic which is common to all cliques is the EXISTSTENCE OF A DEFINED POWER STRUCTURE, GENERALLY COMPRISE OF A LEADER (or a few leaders), FOLLOWERS AND PARIAHS. Thus, it is inaccurate to describe all social groups of teenagers as cliques, as often said groups do not have any particular power structure.