Please note! - If you are playing in full screen mode (not windowed), the 'More Games', 'Full Version' and 'Facebook' buttons will only open their pages in the background, either within iTunes or your default internet browser. You will not be taken directly to these pages, you will need to quit the game before they are visible. A few people have reported that these buttons do not work on the Mac version. This is not the case, they are just behind the game, waiting for you!
Hope this helps until I can make this more obvious in an update!