This document discusses the history and growth of 3D social virtual worlds (SVWs). It outlines how SVWs have evolved from text-based multi-user domains in the 1970s to platforms like Second Life that launched in the early 2000s. SVWs allow users to interact and collaborate and have avatars to represent themselves. The document discusses how SVWs are being used in various areas like business, education, and socially. It concludes that SVWs will continue growing and shaping knowledge-based societies in the future.