The document discusses different types of online groups - communities, networks, and social teams. Communities are defined by common interests of large groups, while networks are based on pre-existing relationships between individuals. Social teams are collections of individuals working together online to achieve a shared goal, and can be massive in scale. The document also examines polarities in online groups around togetherness/separateness and individual/group, and different roles people take on like facilitators, leaders, and content creators.