The document discusses social networking and the purposes and types of social networks. It addresses Dunbar's number which suggests that people can only have close relationships with around 150 people. While people cannot mutually groom with thousands, they can have other connections. It also discusses principles of relationships from Pollard including trust, respect, context, and self-disclosure. The document provides a brief overview of several social networking sites including their purpose, membership levels, and activity levels.
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