This is an updated version of social media buttons. This code snippet will help you to add social media buttons to your website without even using any plugin. Furthermore it's javascript free. Enjoy fast speed and the same usability. For more details visit the official post: https://wpvkp.com/add-social-media-sharing-buttons-to-wordpress-without…

functions.php

// Function to handle the thumbnail request
function get_the_post_thumbnail_src($img)
{
  return (preg_match('~\bsrc="([^"]++)"~', $img, $matches)) ? $matches[1] : '';
}
function wpvkp_social_buttons($content) {
    global $post;
    if(is_singular() || is_home()){
    
        // Get current page URL 
        $sb_url = urlencode(get_permalink());
 
        // Get current page title
        $sb_title = str_replace( ' ', '%20', get_the_title());
        
        // Get Post Thumbnail for pinterest
        $sb_thumb = get_the_post_thumbnail_src(get_the_post_thumbnail());
 
        // Construct sharing URL without using any script
        $twitterURL = 'https://twitter.com/intent/tweet?text='.$sb_title.'&url='.$sb_url.'&via=wpvkp';
        $facebookURL = 'https://www.facebook.com/sharer/sharer.php?u='.$sb_url;
        $bufferURL = 'https://bufferapp.com/add?url='.$sb_url.'&text='.$sb_title;
        $whatsappURL = 'whatsapp://send?text='.$sb_title . ' ' . $sb_url;
        $linkedInURL = 'https://www.linkedin.com/shareArticle?mini=true&url='.$sb_url.'&title='.$sb_title;

       if(!empty($sb_thumb)) {
            $pinterestURL = 'https://pinterest.com/pin/create/button/?url='.$sb_url.'&media='.$sb_thumb[0].'&description='.$sb_title;
        }
        else {
            $pinterestURL = 'https://pinterest.com/pin/create/button/?url='.$sb_url.'&description='.$sb_title;
        }
 
        // Based on popular demand added Pinterest too
        $pinterestURL = 'https://pinterest.com/pin/create/button/?url='.$sb_url.'&media='.$sb_thumb[0].'&description='.$sb_title;
        $gplusURL ='https://plus.google.com/share?url='.$sb_title.'';
 
        // Add sharing button at the end of page/page content
        $content .= '<div class="social-box"><div class="social-btn">';
        $content .= '<a class="col-1 sbtn s-twitter" href="'. $twitterURL .'" target="_blank" rel="nofollow"><span>Share on twitter</span></a>';
        $content .= '<a class="col-1 sbtn s-facebook" href="'.$facebookURL.'" target="_blank" rel="nofollow"><span>Share on facebook</span></a>';
        $content .= '<a class="col-2 sbtn s-whatsapp" href="'.$whatsappURL.'" target="_blank" rel="nofollow"><span>WhatsApp</span></a>';
        $content .= '<a class="col-2 sbtn s-googleplus" href="'.$googleURL.'" target="_blank" rel="nofollow"><span>Google+</span></a>';
        $content .= '<a class="col-2 sbtn s-pinterest" href="'.$pinterestURL.'" data-pin-custom="true" target="_blank" rel="nofollow"><span>Pin It</span></a>';
        $content .= '<a class="col-2 sbtn s-linkedin" href="'.$linkedInURL.'" target="_blank" rel="nofollow"><span>LinkedIn</span></a>';
        $content .= '<a class="col-2 sbtn s-buffer" href="'.$bufferURL.'" target="_blank" rel="nofollow"><span>Buffer</span></a>';
        $content .= '</div></div>';
        
        return $content;
    }else{
        // if not a post/page then don't include sharing button
        return $content;
    }
};
// Enable the_content if you want to automatically show social buttons below your post.

 add_filter( 'the_content', 'wpvkp_social_buttons');

// This will create a wordpress shortcode [social].
// Please it in any widget and social buttons appear their.
// You will need to enabled shortcode execution in widgets.
add_shortcode('social','wpvkp_social_buttons');