Many of our themes include support for Infinite Scroll via the Jetpack plugin. Infinite Scroll enables your visitors to load more posts without having to leave the page.
There are actually several Infinite Scroll style scripts out there. The reason we use the one bundled with Jetpack is because it’s tailored for use with themes, and is generally pretty easy to setup and customize. In many of our themes, you’ll find a jetpack.php file which defines the settings for how various Jetpack features, such as Infinite Scroll, work in that theme. Here is an example of the Infinite Scroll function.