Filter to add lightweight social sharing to WP Genesis themes. Include via functions.php.

social.php

<?php
/**
 * Social sharing buttons meta to Genesis.
 *
 * @package There is no package.
 * @since 1.0.0
 */

// Security.
if ( ! defined( 'ABSPATH' ) ) {
	die( 'Sorry, you are not allowed to access this page directly.' );
}

/**
 * Add social sharing to Genesis entry meta header.
 */
function my_theme_post_info_filter( $post_info ) {
	global $post;
	$arr = array(); // Use this with wp_kses. Don't allow any HTML.
	if ( is_singular() || is_home() ) {

		// Get current page URL.
		$myThemeURL = urlencode( get_permalink() );

		// Get current page title.
		$myThemeTitle = htmlspecialchars( rawurlencode( html_entity_decode( get_the_title(), ENT_COMPAT, 'UTF-8' ) ), ENT_COMPAT, 'UTF-8' );

		$t_user = genesis_get_option( 'my_theme_twitter', my_theme_SETTINGS_FIELD );

		// Construct sharing URL without using any script.
		$twitterURL = '//twitter.com/intent/tweet?text=' . $myThemeTitle . '&amp;url=' . $myThemeURL . '&amp;via=' . $t_user;

		$facebookURL = '//www.facebook.com/sharer/sharer.php?u=' . $myThemeURL;

		// This is for the US Central time zone. Adjust as needed for your location.
    $tz = get_the_modified_time( 'T' );
		if ( 'CST' === $tz ) {
			$ltz = '-6:00';
		} elseif ( 'CDT' === $tz ) {
			$ltz = '-5:00';
		} else {
			$ltz = '';
		}

		$post_info = '<span class="red"><i>by</i> <i class="fas fa-fw fa-user"></i> [post_author_posts_link] <i>on</i> <i class="fas fa-fw fa-calendar-alt"></i>[post_date]</span> &mdash; <span class="entry__meta--no-print"><small><i class="fas fa-fw fa-comments"></i> [post_comments zero="Leave a Comment" one="Read 1 Comment" more="Read % Comments"] or Share:</small>&nbsp;<span class="mpb-social"><a class="mpb-social-link mpb-twitter" href="' . wp_kses( $twitterURL, $arr ) . '" target="_blank" rel="external noopener noreferrer"><i class="fab fa-2x fa-twitter-square"></i> <span class="hide">Tweet this post</span></a>&nbsp;<a class="mpb-social-link mpb-facebook" href="' . wp_kses( $facebookURL, $arr ) . '" target="_blank" rel="external noopener noreferrer"><i class="fab fa-2x fa-facebook-square"></i> <span class="hide">Share this post on Facebook</span></a></span> [post_edit]</span><br /><small><i>Latest revision:</i> <time datetime="' . get_the_modified_time( 'Y-m-d\TG:i:s', true, null, true ) . $ltz . '">' . get_the_modified_date() . '</time></small>';

		return $post_info;

	} else {

		return $post_info;
	}
}

add_filter( 'genesis_post_info', 'my_theme_post_info_filter' );

2022-01-04 Added 'rel="external noopener noreferrer"' to external links for XSS security.