Load only a specific Jetpack module

function tweakjp_only_stats ( $modules ) {
    $return = array();
    $return['stats'] = $modules['stats'];
    return $return;
}
add_filter( 'jetpack_get_available_modules', 'tweakjp_only_stats' );

Disable a specific module

function tweakjp_disable_stats ( $modules ) {
    unset( $modules['stats'] );
    return $modules;
}
add_filter( 'jetpack_get_available_modules', 'tweakjp_disable_stats' );

The Top Posts widget offers different options to display a list of posts, or a grid of post thumbnails. In some cases, you might want to change the size of the thumbnails used by this widget.

To do so, you’ll need to change the size parameters in the image source, by adding the following code to your theme’s functions.php file, or to a functionality plugin:

function jeherve_custom_thumb_size( $get_image_options ) {
        $get_image_options['avatar_size'] = 600;

        return $get_image_options;
}
add_filter( 'jetpack_top_posts_widget_image_options', 'jeherve_custom_thumb_size' );

To change the thumbnail size, you will also need to add some custom CSS to overwrite Jetpack’s default CSS. You can paste this CSS in your theme’s stylesheet, or under Appearance > Edit CSS in your dashboard:

.widget_top-posts .widgets-list-layout li > a {
    width: 40%;
} 

.widget_top-posts .widgets-list-layout img.widgets-list-layout-blavatar {
    max-width: 240px;
    width: 100%;
}

.widget_top-posts .widgets-list-layout div.widgets-list-layout-links {
    max-width: 100%;
    width: 55%;
}

@media only screen and (max-width: 1019px) {

    .widget_top-posts ul.widgets-list-layout {
        max-width: 600px;
        margin: 0 auto;
    } 

    .widget_top-posts .widgets-list-layout div.widgets-list-layout-links {
        font-size: 24px;
    }
}

function jpcarousel_auto_close_comments( $open, $post_id ) {
	$post = get_post( $post_id );

	$days_old = (int) get_option( 'close_comments_days_old' );

	if ( ! $days_old )
		return $open;

	if( $post->post_type == 'attachment' && time() - strtotime( $post->post_date_gmt ) > ( $days_old * DAY_IN_SECONDS ) ) {
		return false;
	}
	return $open;
}
add_filter( 'comments_open', 'jpcarousel_auto_close_comments', 10 , 2 );

// Check if we are on mobile
function jetpackme_is_mobile() {

    // Are Jetpack Mobile functions available?
    if ( ! function_exists( 'jetpack_is_mobile' ) )
        return false;

    // Is Mobile theme showing?
    if ( isset( $_COOKIE['akm_mobile'] ) && $_COOKIE['akm_mobile'] == 'false' )
        return false;

    return jetpack_is_mobile();
}

// Let's remove the sharing buttons, but only if we're on a mobile device
function jetpackme_maybe_add_filter() {

    // On mobile, and on the home page?
    if ( jetpackme_is_mobile() ) {
        remove_filter( 'the_content', 'sharing_display', 19 );
		remove_filter( 'the_excerpt', 'sharing_display', 19 );
    }
}
add_action( 'wp_head', 'jetpackme_maybe_add_filter' );

// Build the function
function jptweak_remove_share() {
	remove_filter( 'the_content', 'sharing_display', 19 );
	remove_filter( 'the_excerpt', 'sharing_display', 19 );
}

function my_remove_shortcode_function( $shortcodes ) {
	$jetpack_shortcodes_dir = WP_CONTENT_DIR . '/plugins/jetpack/modules/shortcodes/';

	$shortcodes_to_unload = array( 'ted.php', 'soundcloud.php', );

	foreach ( $shortcodes_to_unload as $shortcode ) {
		if ( $key = array_search( $jetpack_shortcodes_dir . $shortcode, $shortcodes ) ) {
			unset( $shortcodes[$key] );
		}
	}

	return $shortcodes;
}
add_filter( 'jetpack_shortcodes_to_include', 'my_remove_shortcode_function' );

if( function_exists( 'jetpack_photon_url' ) ) {
    add_filter( 'jetpack_photon_url', 'jetpack_photon_url', 10, 3 );
}
function jeherve_display_custom( $content, $post ) {

	global $post;

	// If you didn't define a post thumnail, let's forget about all this
	if ( !has_post_thumbnail( $post->ID ) )
		return $content;

	// What's the cropping and the size of image we should use on Single pages?
	// See http://developer.wordpress.com/docs/photon/api/#crop for parameters
	if ( is_single() ) {
		$args = array(
		    'crop'   => '50,50,200px,200px',
		);
	}
	// resizing on other pages
	else {
		$args = array(
		    'resize'   => '200,400',
		);
	}

	// Let's create a Photon Image URL from the Post Thumbnail
	$feat_image_url = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'full');
	$photon_image_url = jetpack_photon_url( $feat_image_url[0], $args );

	// Let's build the image tag
	$our_image = sprintf( '<div class="post-media"><a class="featured-image" href="%1$s" title="%2$s"><img src="%3$s" class="wp-post-image" alt="Featured Image"></a></div>',
		esc_url( get_permalink() ),
		esc_attr( sprintf( __( 'Open %s', 'dot' ), get_the_title() ) ),
		esc_attr( $photon_image_url )
	);

	// Let's return the image, right before the post content
	return $our_image . $content;

}
add_filter( 'the_content', 'jeherve_display_custom' );

When you share a post on Facebook, or when Jetpack Social auto-shares a post to your Facebook page, Facebook crawls the page and looks for Open Graph meta tags to build a complete post preview (with an image, title, description, …).

Jetpack automatically creates these meta tags for you, so you don’t have to worry about it!

Jetpack will also add an Image meta tag to your home page if you use a Site Logo, or a Site Icon. If you don’t use any of these 2 options, you might want to add your own custom image meta tag there. To do so, add one of the following code snippets to your theme’s functions.php file, or to a functionality plugin:

function fb_home_image( $tags ) {
	if ( is_home() || is_front_page() ) {
		// Remove the default blank image added by Jetpack
		unset( $tags['og:image'] );

		$fb_home_img = 'YOUR_IMAGE_URL';
		$tags['og:image'] = esc_url( $fb_home_img );
	}
	return $tags;
}
add_filter( 'jetpack_open_graph_tags', 'fb_home_image' );

Alternatively, you can change the default image used any time Jetpack can not determine an image to use:

function custom_jetpack_default_image() {
	return 'YOUR_IMAGE_URL';
}
add_filter( 'jetpack_open_graph_image_default', 'custom_jetpack_default_image' );

It’s worth noting that the fallback image has to be larger than 200 x 200px, as per Facebook requirements. If your image is smaller, Facebook will ignore it.

function tweakjp_custom_is_support() {
	$supported = current_theme_supports( 'infinite-scroll' ) && ( is_home() || is_archive() || is_search() );
	
	return $supported;
}
add_filter( 'infinite_scroll_archive_supported', 'tweakjp_custom_is_support' );