Persuasion and Groups

In the social sciences a group can be defined as two or more humans who interact with one another, accept expectations and obligations as members of the group, and share a common identity. By this definition, society can be viewed as a large group.
A true group exhibits some degree of social cohesion and is more than a simple collection or aggregate of individuals. Characteristics shared by members of a group may include interests, values, representations, ethnic or social background, and kinship ties
Types of groups
Primary groups are small groups with intimate, kinship-based relationships: families, for example. They commonly last for years. They are small and display face-to-face interaction.
Secondary groups, in contrast to primary groups, are large groups involving formal and institutional relationships. They may last for years or may disband after a short time.
Other types of groups include the following:
Peer group
A peer group is a group with members of approximately the same age, social status, and interests. Generally, people are relatively equal in terms of power when they interact with peers.
An informal, tight-knit group, often in a High School/College setting, that shares common interests. Most cliques exhibit an established yet shifting power structure.
A club is a group, which usually requires one to apply to become a member. Such clubs may be dedicated to particular activities: sporting clubs, for example.
All individuals who live in the same home.
A community is a group of people with a commonality or sometimes a complex net of overlapping commonalities, often–but not always–in proximity with one another with some degree of continuity over time.
An organization which runs several instances of a business in many locations.
A gang is usually an urban group that gathers in a particular area. It is a group of people that often hang around each other. They...