Add po.st social sharing buttons to a Genesis child theme without a plugin

genesis-social-sharing-buttons.php

<?php
/**
 * Adds po.st social sharing buttons
 * to single posts and pages.
 * Create an account at http://po.st
 * to get a publisher key.
 *
 * @author      Robert Neu
 * @link        http://youneedfat.com
 * @copyright   Copyright (c) 2013, FAT Media, LLC
 * @license     GPL-2.0+
 */

add_action( 'wp_enqueue_scripts', 'prefix_add_social_script' );
//* Load the required JavaScript
function prefix_add_social_script() {
	//* Add as many post types as you like.
	$post_types = array( 'post', );
	//* Load the script only where we need it.
	if ( is_singular( $post_types ) ) {
		wp_enqueue_script( 'post-buttons', '//i.po.st/share/script/post-widget.js#publisherKey=yourkeyhere', array(), '1.0', true );
	}
}

add_action( 'genesis_before_loop', 'prefix_add_social_buttons' );
//* Display social buttons on single posts
function prefix_add_social_buttons() {
	//* Add as many post types as you like.
	$post_types = array( 'post', );
	//* Load the buttons only where we need them.
	if ( is_singular( $post_types ) ) {
		//* Add sharing buttons before the post
		add_action( 'genesis_after_post_content', 'prefix_do_social_buttons' );
		//* Add sharing buttons after the post
		add_action( 'genesis_before_post_content', 'prefix_do_social_buttons' );
	}
	//* Render html for the sharing buttons
	function prefix_do_social_buttons() {
		echo'<div class="pw-widget addthis_toolbox pw-counter-horizontal pw-share-popups" pw:twitter-via="YourTwitterHandle">';
			echo'<a class="pw-button-facebook pw-look-native"></a>';
			echo'<a class="pw-button-twitter pw-look-native"></a>';
			echo'<a class="pw-button-linkedin pw-look-native"></a>';
			echo'<a class="pw-button-googleplus pw-look-native"></a>';
			echo'<a class="pw-button-post-share"></a>';
		echo'</div>';
	}
}