Many social networks and portals use infinite scrolling to provide their visitors with a more convenient experience. It is a nice alternative than forcing your visitors to click on next/previous posts links. You can easily add such functionality to WordPress using the Infinite-Scroll plugin. It uses AJAX to implement this feature.
The Infinite-Scroll works with most themes. It is customizable, so you can adapt it to your site and theme. It automatically retrieves and appends the content of the next page of posts as your visitors scroll toward the bottom of your pages. The plugin is written in a way that does not break your website and other plugins you may be using.
The Infinite-Scroll plugin installs easy and makes your pages more sticky. It is worth testing if you have a ton of content on your site.