A basic customisation to add social icons in Genesis Author Box

Genesis Author Box Customisation

/**
 * Author Box With Social Icons
 *
 * This function will add social icons to author box in genesis. Add this to your function.php
 *
 * @author  MetaBlogue
 * @license GPL-2.0+
 * @link    https://metablogue.com/genesis-add-social-media-icons-author-box/
 */
add_filter( 'genesis_author_box','custom_author_box', 10, 6);
function custom_author_box($output, $context, $pattern, $gravatar, $title, $description) {
  
  //Create Social Buttons
  $google_plus   = get_the_author_meta( 'googleplus' );
  $twitter   = "https://twitter.com/" . get_the_author_meta( 'twitter' );
  $facebook   = get_the_author_meta( 'facebook' );
  $youtube   = get_the_author_meta( 'youtube' );
  $social_buttons = '';
  if ($google_plus) {
     $social_buttons .= '<a class="social-buttons" title="My Google +" rel="nofollow noopener" href="' . esc_url($google_plus) . '" target="_blank">Google+</a>'; }
  if ($twitter) {
     $social_buttons .= '<a class="social-buttons" title="Twitter" rel="nofollow noopener" href="' . esc_url($twitter) . '" target="_blank">Twitter</a>'; }
  if ($facebook) {
     $social_buttons .= '<a class="social-buttons" title="Facebook" rel="nofollow noopener" href="' . esc_url($facebook) . '" target="_blank">Facebook</a>'; }
  if ($youtube) {
     $social_buttons .= '<a class="social-buttons" title="YouTube" rel="nofollow noopener" href="' . esc_url($youtube) . '" target="_blank">YouTube</a>'; }
	
  //Title formatting is moved to $pattern and we need to recreate it now
  $heading_element = 'h1';
  if ( 'single' === $context && ! genesis_get_seo_option( 'semantic_headings' ) ) {
  	$heading_element = 'h4';
  } elseif ( genesis_a11y( 'headings' ) || get_the_author_meta( 'headline', (int) get_query_var( 'author' ) ) ) {
	$heading_element = 'h4';
  }
  
  //Change the gravtar size to 120 px
  $gravatar_size = apply_filters( 'genesis_author_box_gravatar_size', 120, $context );
  $gravatar      = get_avatar( get_the_author_meta( 'email' ), $gravatar_size );
  
  /* The author box markup, contextual - recreate with Social Icons */
  $pattern  = sprintf( '<section %s>', genesis_attr( 'author-box' ) );
  $pattern .= '%s<' . $heading_element . ' class="author-box-title">%s</' . $heading_element . '>';
  $pattern .= '<div class="author-box-content" itemprop="description">%s';
  if ($social_buttons)
    $pattern .= '<hr />%s';
  $pattern .= '</div></section>';
    
  if ($social_buttons) {
	  return sprintf( $pattern, $gravatar, $title, $description, $social_buttons );
  } else {
	  return sprintf( $pattern, $gravatar, $title, $description);	
  }
}

Style.css

.author-box {
    box-shadow: 0 0 10px rgba(0,0,0,.1);
    border: 1px solid #b3b3b3;
}

.author-box .avatar  {                 
border-radius: 50% 50% 50% 50%;       
}

a.social-buttons {
	background-color: #333;
	border-right: 1px solid #fff;
	color: #fff;
	float: left;
	font-size: 10px;
	font-size: 1rem;
	overflow: hidden;
	padding: 8px 0;
	padding: 0.8rem 0;
	text-align: center;
	text-decoration: none;
	text-transform: uppercase;
	width: 25%;
}

a.social-buttons.last {
	border: none;
}

a.social-buttons:hover {
	background-color: #f96e5b;
}