What is the secret of the success of Second Life? We don't know! But in comparison to other platforms for immersive worlds, including MMORPGs such as World of Warcraft and Everquest, Second Life seems to offer an optimal combination of avatar modification options, gesture animations, in-game construction tools, and facilities for communication and social networking, such as chatting and instant messaging. Cf.  [Utz (2003)]. Incorporating elements of community formation, commonly denoted as Web 2.0, and exemplified in MySpace, YouTube and Flickr, the immersive appearance, perhaps also the built-in physics and the inclusion of elementary economic principles, seem to be the prime distinguishing factors responsible for the success of Second Life. In addition, the possibility of recording collaborative enacted stories,  [Davenport (2000)], using built-in machinima certainly also contributes to its appeal.