Infinite Scroll Automatically append the next page of posts to your page when a user scrolls to the bottom. The concept of loading the next content continuously as the users scrolling down the page. So long as there is still content available scrolling will keep showing the next line of content. You can find this kind of experience implemented in Facebook, LinkedIn , twitter.
WordPress Plugin Installation
Download the plugin. http://wordpress.org/plugins/infinite-scroll/
1- Install it to your /wp-content/plugins/ directory
2- Activate the plugin in your WordPress Admin UI.
3- Visit the Settings / Infinite Scroll page to set up the css selectors.