Since they have announced this to the media, I can say that I was one of the test subjects for this a few months ago. Working through the Lighthouse in San Francisco, I signed up and was invited to go down to Facebook to test this very software. It was a very cool experience, and as far as I could tell they really enjoyed my feedback for the 1.5 hours I got to play with this new technology. It will be great to see it become much more functional in the coming months and see how people enjoy it when it is finally rolled out.