Furland: Generate a real-time graph of Twitter friends, grouped by interests

I've run it, and got an interesting result. I've played with the controls, and I have no idea what this is doing, or what the results mean.

It's absolutely gorgeous, and I'm sure there's information there, but I really don't know what it's showing me. Which is a shame ... I feel like this is a fantastic resource that's available, but I can't understand.