In case you haven't already heard, Nature Publishing Group has been quietly working on a social networking site for scientists for the past year called Nature Network Beta for the Boston area. According to Nature Network editor, Corie Lok, Nature Network will soon go global and will also add a local London version. It seems that they're waffling between global versions a la MySpace and local versions a la Craigslist. There are clearly advantages to both and no reason that they can't create a hybrid with global and local functions just like Craigslist. They're also looking to add new cities. I'm sure New York can't be far behind, but other cities mentioned include Singapore, San Francisco, and Shanghai.