When you Stack pages, they’re displayed as a continuously scrolling vertical feed. You can Stack individual Sets of pages, or your entire site. To Stack a Set, right-click the Set’s name. Stacked pages can be combined with Pinned pages. 

In this Video:
Using Sets
Displaying pages as a Stack
Making a Stacked Set a Home page
Set an entire site to display as a continuous Feed
Reordering pages in a Stacked Set
Using Stacks to add a blog or news feed to a site