This document discusses social networks and their characteristics. Social networking involves connecting with others online through sites like Facebook and LinkedIn. It allows users to share photos, links, interests and advocate for causes and beliefs. Social networks are websites that allow users to create profiles and exchange public or private messages with others who share personal or professional interests. Key characteristics include community building, participation, conversation and openness. The document also outlines advantages like reduced costs for business and improved communication for education, as well as disadvantages like privacy risks, identity theft and lack of meaningful conversation.