My 2nd WordPress theme based on the underscores skeleton.
Like all my designs, it too uses media queries for responsiveness and some jQuery to hide/unhide the menu on smaller screens. The Facebook style scrolling of content is achieved by using a plugin called JetPack with infinite scroll.
I’ve customized the default infinite scroll footer and now it only adds a small up arrow once you start scrolling down. I can teach you how to do that in this article!
*edit* It looks pretty bad on the screenshot, but I’ve made a lot of improvements and I am still using the same theme on my main blog. Just saying…