Article: Where You Can Be Yourself, Version 2.0; Tens of millions of Internet users participate in virtual worlds -- communities that often allow subscribers to interact through online characters. A virtual world offers subscribers the chance to meet others while stepping out of their real-life characters. Users can modify their animated alter egos, changing their appearance, personality or even sex.

There are different types of virtual worlds: computer games, social sites and reality-based sites.

Gaming sites let you play with multiple players at the same time. The best known gaming community is Blizzard Entertainment's World of Warcraft, which has 7 million subscribers playing its fantasy game.

Social sites let users socialize with others through their alter egos, shop and even go clubbing. The best known is Second Life, which has 2 million subscribers; at any given moment, up to 10,000 are online.

Reality-based sites, such as Microsoft's Virtual Earth, offer depictions of real-world mapping and photography that have been enhanced by 3-D ...

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