Second Life
via Linden Research, Inc. wikipedia page:
“Although Linden Lab's Second Life platform was not the first online virtual world, it has gained a large amount of attention due to its expanding user base and unique policy that allows participants to own the intellectual property rights to the in-world content they create. The company's name comes from Linden Street, where the company was originally based. The company's transition from scrappy upstart to success is detailed in the book The Making of Second Life written by former employee Wagner James Au.
Although many people have assumed that the inspiration for Second Life originated from Rosedale's exposure to Neil Stephenson's novel Snow Crash, he has suggested that his vision of virtual worlds predates that book and that he conducted some early virtual world experiments during his college years at the University of California San Diego, where he studied physics.[5]
Rosedale's strong coding skills eventually resulted in the creation of a video compression technology that would later be acquired by RealNetworks, where he was made CTO at the age of 27. While at RealNetworks, Rosedale's ambition to create a virtual world was resurrected and recharged by technological advances in computing and his attendance at the popular music and arts festival Burning Man.”
source: https://en.wikipedia.org/wiki/Linden_Lab
VIDEO SAMPLE of the "Second Life" Virtual World:
Second Life seems oddly similar to "Society" a type of real-life facebook, so to speak, used by characters in the seminal transhumanist hollywood film "Gamer" (2009). In this film, "Society" involved people literally controlling other humans/avatars like puppets in a "virtual" world - one that is not so virtual.
Notice the similarity between Burning Man and Gamer's "Society" - They're both a hedonistic playground for mindless drones who have lost any sense of attachment to the real world or themselves...