[WordPress] Code from our blog post Using the Infinite Scroll Module in JetPack - http://www.limecanvas.com/using-the-infinite-scroll-module-in-jetpack/

code-snippet-1.php

/**
 * Add support for JetPack infinite scroll
 **/

add_theme_support( 'infinite-scroll', array(
    'container' => 'content',
    'footer' => 'page',
  ) 
);

code-snippet-2.php

/**
 * Add theme support for infinite scroll
 *
 * @uses add_theme_support
 * @action after_setup_theme
 * @return null
 */
function twenty_twelve_infinite_scroll_init() {
	add_theme_support( 'infinite-scroll', array(
		'container'      => 'content'
	) );
}
add_action( 'after_setup_theme', 'twenty_twelve_infinite_scroll_init' );

code-snippet-3.php

/**
 * Add theme support for infinity scroll
 */
function twenty_eleven_infinite_scroll_init() {
	add_theme_support( 'infinite-scroll', array(
		'container'      => 'content',
		'footer_widgets' => array( 'sidebar-3', 'sidebar-4', 'sidebar-5' ),
		'footer'         => 'page',
	) );
}
add_action( 'init', 'twenty_eleven_infinite_scroll_init' );

code-snippet-4.php

/**
 * Add theme support for infinity scroll
 */
function twenty_ten_infinite_scroll_init() {
	add_theme_support( 'infinite-scroll', array(
		'container' => 'content',
		'render'    => 'twenty_ten_infinite_scroll_render',
		'footer'    => 'wrapper',
	) );
}
add_action( 'init', 'twenty_ten_infinite_scroll_init' );

/**
 * Set the code to be rendered on for calling posts,
 * hooked to template parts when possible.
 *
 * Note: must define a loop.
 */
function twenty_ten_infinite_scroll_render() {
	get_template_part( 'loop' );
}

code-snippet-5.html

/* Infinite Scroll */
/* Hides navigation links and site footer when infinite scroll is active */
body .infinite-scroll .navigation,
body .infinite-scroll.neverending #footer {
 display: none;
}
/* Shows the footer again in case all posts have been loaded */
body .infinity-end.neverending #footer {
 display: block;
}

code-snippet-6.css

/* Infinite Scroll - footer content */
#infinite-footer .container{
width: 960px !important;
background-color: #a9cf38;
border-top: 1px solid #7f9c2a;
color: #fff;
}

#infinite-footer .container a{
color: #fff;
}

#infinite-footer .container a:hover{
text-decoration: underline;
color: #fff;
}

/* Inifnite Scroll - Spinner */
.infinite-loader{
color: #929292;
}