Second Life is a 3-D virtual world entirely created by its Residents. Opening in 2003, it was seen especially in 2006/2007 as a major development in the internet. It has however been overtaken in importance by Facebook since then. In November 2010, 21.3 million accounts were registered, but there are no reliable figures for actual long-term consistent usage.

Since December 2010, the minimum age for Second Life visitors is 16 years.

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