Simple social links extra_field for drupal.

gistfile1.php

<?php

// Social share links
$links = array();
$share_url = url('node/'.$node->nid, array('absolute' => TRUE));
$links['facebook'] = array(
  'href' => 'https://www.facebook.com/sharer/sharer.php?u='.$share_url,
  'title' => t("Facebook"),
  'attributes' => array(
    'data-popup-width' => 700,
    'data-popup-height' => 300,
  ),
);
$links['twitter'] = array(
  'href' => 'https://twitter.com/intent/tweet?text='.$share_url,
  'title' => t("Twitter"),
  'attributes' => array(
    'data-popup-width' => 550,
    'data-popup-height' => 220,
  ),
);
$links['googleplus'] = array(
  'href' => 'https://plus.google.com/share?url='.$share_url,
  'title' => t("Google+"),
  'attributes' => array(
    'data-popup-width' => 600,
    'data-popup-height' => 330,
  ),
);

$node->content['social_share'] = array(
  '#prefix' => '<div class="social-share">',
  '#suffix' => '</div>',
  '#theme' => 'links',
  '#links' => $links,
  '#heading' => array(
    'text' => t("Partager sur :"),
    'level' => 'div',
    'class' => array('social-share-title')
  ),
  '#attributes' => array(
    'class' => array('social-share-links')
  ),
  '#attached' => array(
    'js' => array(
      '(function($){
        if ($(window).width() > 500) {
          $(".social-share-links a").click(function(e){
            e.preventDefault();
            var h = $(this).attr("data-popup-height"),
                w = $(this).data("popup-width");
            window.open(
              $(this).attr("href"),
              "share",
              "top="+((screen.height-h)/2)+",left="+((screen.width-w)/2)+",width="+w+",height="+h
            );
          });
        }
      })(jQuery);' => array('type' => 'inline')
    )
  )
);