Wow neat! LambdaMOO was such an influential thing for. MUDs in general had a lot of influence, both in social media and gaming. And then LambdaMOO had the specific brief of being a social media experiment. Neat to see the tech reborn!
Pavel Curtis is still out there, LinkedIn says he recently left his job at Microsoft after 20 years. He also runs a puzzle shop: http://www.pavelspuzzles.com/site/