on October 30, 1990. According to Jill Serpentelli in her paper Conversational Structure and Personality Correlates of Electronic Communication: Curtis went on to explain how the transition occurred from AlphaMOO to LambdaMOO. After fixing bugs in the system, rewriting some of the code, adding more programming capability, and writing documentation, he had created what he termed "a truly separate entity" from the original AlphaMOO. He dubbed this new system LambdaMOO, after one of his names on the system and, according to Curtis, "because it's a key word in some of the other non-mud research that I do." The new system was announced as open for public access on UseNet (a world-wide bulletin board system) in February 1991 (Curtis, personal communication). MOO was originally developed as a MUD server in the same general style (sharing much of the command syntax and community conventions) as TinyMUD. There are currently two distributions of the MOO server code. The more popular of the two, the LambdaMOO server, is named such as indication of the close historical and continuing association of the MOO server code with the first public MOO, LambdaMOO. The LambdaMOO version of MOO that gained popularity in the early 1990s, and it remains the most widely used MOO distribution. Pavel Curtis continued to maintain the server for several years. Other early contributors to the LambdaMOO server included users Tim Allen ("Gemba"), "Gary_Severn", Roger Crew ("Rog"), Judy Anderson ("yduJ"), and Erik Ostrom (known as "Joe Feedback"). Later, Erik Ostrom maintained the server, and the server is now maintained by Ben Jackson and Jay Carlson and has a LambdaMOO SourceForge.net project. Social behavior on MOOs Behavior on social MOOs and role-playing MOOs has been shown to differ. For example, an early study looked at whether users engaged in gender-switching (that is, adopting a different gender online). The majority of participants (60 percent) in social MOOs had never engaged in gender-switching, while the majority (56.7 percent) in role-playing MOOs had done so. However, most of those engaged in gender-switching did so on average only 10 percent of the time. The study also found that the primary barrier to gender-switching was the belief that it is dishonest and manipulative. Current projects based on MOO Stunt is a backward compatible fork of the latest MOO server code. It adds multiple inheritance, anonymous objects, native HTTP support, JSON parsing and generation, a native map datatype, and better cryptography