Demographics - Statistical data relating to the population and particular groups within it. In gaming, the target audience is often separated demographically.

Specialist interest group - A Special Interest Group (SIG) is a community within a larger organization with a shared interest in advancing a specific area of knowledge.  

Social differentiation - The distinction made between social groups and persons on the basis of biological, physiological, and sociocultural factors, as sex, age, or ethnicity, resulting in the assignment of roles and status within a society. This matters in gaming to persuade the audience, you have to mind their social differentiation.