I wish it was still around, my memory is fuzzy and there are very few screenshots to go on. But I would make something more advanced anyway. Just going by comment likes is not enough. What I remember though, is Digg made ME want to improve my courtesy, to improve my score and therefore influence. That kind of system the world needs badly.
Most sites you have to click the thumbnail, then click play, then click the fullscreen button. That said, it’s optional under settings.