To be part of the "in crowd," you learn that you should get a certain type of tattoo, dress in the right clothes, agree with the group's attitudes and opinions, and be able to use and understand the "language" of the group. These are examples of what social psychologists call

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These are examples of social norms, which are the expected standards of conduct within a group that influence behavior.  Social norms can be broad guidelines or specific standards of conduct. They are the expectations for socially appropriate attitudes and behaviors that are embodied in the explicit or implicit standards of a group.

To Be Part of the "In Crowd," You Learn That