This looks really cool, the world needs more stuff like this.

One minor complaint is with the scrollable slide-outs. When you scroll down through a slide-out like the Instagram one, and reach the bottom, the page behind starts scrolling.

This is a common problem, and why I dislike using scrollable areas on web pages in the first place. There must be a good way to fix this. I just don't want the outside area to scroll when my context is inside the small scrollable area.