Options for Jetpack's Related Posts module

gistfile1.php

<?php
/**
 * Set Jetpack related posts image size
 *
 * @since 1.0.0
 * @param array $thumbnail_size
 * @return array
 */
function ja_jetpack_related_posts_size ( $thumbnail_size ) {
	$thumbnail_size['width']  = 140;
	$thumbnail_size['height'] = 140;
	$thumbnail_size['crop']   = true;
	return $thumbnail_size;
}
add_filter( 'jetpack_relatedposts_filter_thumbnail_size', 'ja_jetpack_related_posts_size' );

/**
 * Set Jetpack related posts count
 *
 * @since 1.0.0
 * @param array $options
 * @return array
 */
function ja_jetpack_related_posts_count( $options ) {
    $options['size'] = 4;
    return $options;
}
add_filter( 'jetpack_relatedposts_filter_options', 'ja_jetpack_related_posts_count' );

/**
 * Remove default placement of Jetpack related posts.
 * 
 * For manual placment use do_shortcode( '[jetpack-related-posts]' );
 * 
 * @since 1.0.0
 */
function ja_jetpack_related_posts_placement() {
	if ( class_exists( 'Jetpack_RelatedPosts' ) ) :
		$jprp = Jetpack_RelatedPosts::init();
		$callback = array( $jprp, 'filter_add_target_to_dom' );
		remove_filter( 'the_content', $callback, 40 );
	endif;
}
add_filter( 'wp', 'ja_jetpack_related_posts_placement', 20 );