New Religious Movements are composed from

“two or more individuals who share a common social identification of themselfs or, which is nearly the same thing, percieve themselves to be members of the same social category”.

Turner, 1982: 15
 

Since such a group exists in an individual (the belongingness is psichological, phenomenologically real and has important self-evaluative consequences) he or she manifests a group behavior also in absence of physical presence of others. Thus, the theory of social identity enables us to understand “invisible” groups, such as Internet communities, and also to develop our explanation of group dynamics without the concept of personal attraction (cohesiveness) of members.