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Wikipedia says…

Second Life (abbreviated as SL) and its sister site Teen Second Life are Internet-based computer games launched June 23, 2003 and developed by Linden Research, Inc, which came to international attention via mainstream news media in late 2006 and early 2007. Second Life caters for users aged over 18, while Teen Second Life is restricted to users aged between 13 and 18. A free downloadable client program called the Second Life Viewer enables its users, called "Residents", to interact with each other through motional avatars, providing an advanced level of a social network service combined with general aspects of a metaverse. Residents can explore, meet other residents, socialize, participate in individual and group activities, and create and trade items (virtual property) and services with one another.