generate_press_social_sharing_after_post_meta.php

<?php
add_filter( 'generate_post_author_output', function( $output ) {
	if ( is_singular( 'post' ) ) {
		$current_id = get_the_ID();
		$social_links = [];
		
		// Add opening div
		$social_links[] = '<div class="social-sharing">';
		// Intro Text
		$social_links[] = '<span>Artikel teilen: </span>';
		// E-Mail
		$social_links[] = '<a class="email" href="mailto:?subject=Spannender Artikel für dich: ' . get_the_title( $current_id ) . '&amp;body=Schau mal ' . get_permalink( $current_id ) . '">E-Mail Icon</a>';
		// Facebook
		$social_links[] = '<a class="facebook" href="<a href="https://www.facebook.com/sharer/sharer.php?u=' . get_permalink( $current_id ) .  '">FB Icon</a>';
		// Twitter
		$social_links[] = '<a class="twitter" href="https://twitter.com/home?status=' . get_the_title( $current_id ) . ' ' . get_permalink( $current_id ) . '">Twitter Icon</a>';
		// Add closing div
		$social_links[] = '</div>';
		
		// Glue the original output with our custom links.
		$output = $output . implode( $social_links );
	}
	
	// Always return the ouput, because it's a filter.
	return $output;
} );