This document provides teaching objectives and outlines for a chapter on social networks, auctions, and portals. The key topics covered include: defining different types of social networks and their business models; describing major types of auctions, benefits and costs, and how they operate; explaining the major types of internet portals and their business models. Case studies are provided on the transformation of AOL and evolution of eBay's business model. Teaching suggestions guide instructors on discussing each section and posing discussion questions to students.