This document discusses using social networks for e-commerce marketing. It defines social networks as structures of nodes (individuals) connected by relationships. Popular social networks like Hi5 and Facebook allow individuals to share interests and activities, represented as profiles. The document suggests marketing products to 1% of profiles on Hi5, noting glitter and ads in comments are common. On Facebook, apps are popular. It also describes social shopping sites like ThisNext that allow users to recommend products to others and include links to purchase them.