A Facebook like modal photo library

Very slick!<p>How are +/- stars done? I clicked the star a few times, and it seemed to count down from 4 to -3, which persisted on page reload. I'm not sure if others found a "subtract stars" button that I did not notice, or if I was causing it.

This is a pretty neat clone. But wasn't Facebook's own implementation a ripoff of Google+?