The document discusses the concept of social navigation in the context of Web 2.0 and how user behavior and interactions online leave digital traces that can guide others. It describes how features like tagging, comments, and indications of what content other users have engaged with act as "behavioral footprints" that allow for indirect social navigation. Additionally, technologies like social networks make direct social navigation possible by showing who is online or in virtual spaces in real-time. The document argues that social navigation facilitated by user-generated content and connections between users is a defining aspect of Web 2.0.