Has Anybody Else Tried Graph Search on Facebook

Hi Everybody,
Just wanted to share something that I found on Facebook that I came across while reading Jon Loomer's blog: Graph Search on Facebook.
It's a nifty way to search up people on Facebook and find out what categories and groups that they like. Opened up quite a few ways to market on Facebook.
Wanted to know if other people have tried it out, and maybe share some thoughts on its uses?

See original post by YesAdvertisingProgram