This document discusses various advertising and branding models that are used in social virtual worlds, including product placement, sponsored promotions, entire branded virtual worlds ("Adverworlds"), co-branded spaces, and member-generated brands. Product placement involves incorporating real-world brands into virtual objects, while sponsored promotions tie brand activities to specific events. Adverworlds are fully-branded virtual worlds created to promote a single brand. Co-branded spaces allow multiple advertisers to promote in popular areas. Member-generated brands allow users to create and promote their own virtual brands, most commonly in areas like avatar customization, real estate, and event planning.