This is not exactly the same, but I remember seeing a service in the news a few years ago where they would match scholars and geeks (e.g. you could look specifi

This is not exactly the same, but I remember seeing a service in the news a few years ago where they would match scholars and geeks (e.g. you could look specifically for ornithologists, if you're a bird geek). It's not exactly anonymous, but the main focus was on areas of (very specific) interest, rather than physical appearance.