1) Co-creation with external networks can impact business models by reducing costs of customization, ideation, and design or increasing brand awareness and sentiment.
2) Different levels of commitment in co-creation include visitors, testers, participants, creators, and collaborators, motivated by factors like engagement, influence, uniqueness, and respect.
3) Communities that support co-creation can include brand communities focused on marketing, subcultures interpreting brands locally, and neotribes building skills around products/services.