I'm in the process of building out a simple Facebook app and had trouble finding a way to "rank" friends, namely who was closest to the logged-in user.

So, I just built my own web service to do so: Facebook Friend Rank.

I bundled the whole thing as a web service rather than a gem or stand-alone library because I'm sure most people would want something they can just plug-in (or make a call to) without worrying about the complexities of running background jobs, setting up another service on their boxes, etc.

I think Goliath serves as a solid underpinning as this project evolves. The evented nature of the web service should scale well as the ranking algorithm evolves to process multiple API calls in parallel.

All told, I'm happy to launch the project to HN, if only for some initial feedback.

Thanks!