Full code of Facebook comment Box in Genesis Theme: http://extracatchy.net/add-facebook-comments-in-wordpress/

functions.php

<?php 
/**
 * Facebook Comments Box
 * @link http://extracatchy.net/add-facebook-comments-in-wordpress/ 
 */
function extracatchy_facebook_comments() {
	echo '<h2>Submit a Comment</h2>';
	echo '<div class="fb-comments" data-href="' . get_permalink() . '" data-numposts="5" data-width="100%"></div>';
}
add_action( 'genesis_after_entry', 'extracatchy_facebook_comments' );
remove_action( 'genesis_after_entry', 'genesis_get_comments_template' );

/**
 * Facebook Comment Moderator
 */
function be_facebook_comment_moderator() {
  
  // Using your individual facebook ID
  echo '<meta property="fb:admins" content="{YOUR_FACEBOOK_USER_ID}" />';
  
  // Or using a Facebook App ID
  echo '<meta property="fb:app_id" content="{YOUR_APP_ID}" />';
  
}
add_action( 'wp_head', 'be_facebook_comment_moderator' );


/**
 *  Add Facebook SDK
 * 
 */
function be_facebook_sdk() {
  ?>
<div id="fb-root"></div>
<script>(function(d, s, id) {
  var js, fjs = d.getElementsByTagName(s)[0];
  if (d.getElementById(id)) return;
  js = d.createElement(s); js.id = id;
  js.src = "http://connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.5&appId=123456789123456"; /* change appID to yours */
  fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>  
  <?php
  
}
add_action( 'genesis_before', 'be_facebook_sdk' );

/**
 * Facebook for Comment Count 
 *
 * @param int $count
 * @param int $post_id
 * @return int $count
 */
function ea_facebook_for_comment_count( $count, $post_id ) {
	
	if( ! function_exists( 'ea_share' ) )
		return $count;
		
	return ea_share()->core->count( $post_id, 'facebook_comments' );	
}
add_filter( 'get_comments_number', 'ea_facebook_for_comment_count', 10, 2 );

This is the full code of adding facebook comments in your genesis theme. I have build a tutorials based on this code at http://extracatchy.net/add-facebook-comments-in-wordpress/