Firefox 11.0 on Ubuntu 12. I finally found that by maneouvering carefully I could find somewhere outside the huge slab and click there. Not easy on my setup. And did I mention that it was annoying?
Personally, I also found the interface too sparse, and rather unclear as to what it was showing me and why. I was not engaged, and after thinking about why for a few minutes, I have no idea. I just don't feel any level of interest for it. My only reason might be that it's an aggregation of other sites, and I can't be bothered to learn more about how to turn off the source sites I know I don't care about.