K2 social buttons not appear

<?php if($this->item->params->get('itemSocialButton') && !is_null($this->item->params->get('socialButtonCode', NULL))): ?> <!-- Item Social Button --> <li> <?php echo $this->item->params->get('socialButtonCode'); ?> </li> <?php endif; ?> <!-- Item social links --> <div class="itemSocialLinksBlock"> <span><?php echo JText::_('K2_SOCIAL_SHARING'); ?></span> <ul class="itemSocialLinks"> <li><a class="googlebuzz" title="<?php echo JText::_('K2_ADD_TO_GOOGLE_BUZZ'); ?>" href="http://www.google.com/buzz/post?url=<?php echo $this->item->socialLink; ?>&amp;message=<?php echo urlencode($this->item->title); ?>" target="_blank"><span><?php echo JText::_('K2_ADD_TO_GOOGLE_BUZZ'); ?></span></a></li> <li><a class="facebook" title="<?php echo JText::_('K2_ADD_TO_FACEBOOK'); ?>" href="http://www.facebook.com/sharer.php?u=<?php echo $this->item->socialLink; ?>&amp;t=<?php echo urlencode($this->item->title); ?>" target="_blank"><span><?php echo JText::_('K2_ADD_TO_FACEBOOK'); ?></span></a></li> <li><a class="delicious" title="<?php echo JText::_('K2_ADD_TO_DELICIOUS'); ?>" href="http://del.icio.us/post?url=<?php echo $this->item->socialLink; ?>&amp;title=<?php echo urlencode($this->item->title); ?>" target="_blank"><span><?php echo JText::_('K2_ADD_TO_DELICIOUS'); ?></span></a></li> <li><a class="digg" title="<?php echo JText::_('K2_DIGG_THIS'); ?>" href="http://digg.com/submit?url=<?php echo $this->item->socialLink; ?>&amp;title=<?php echo urlencode($this->item->title); ?>" target="_blank"><span><?php echo JText::_('K2_DIGG_THIS'); ?></span></a></li> <li><a class="reddit" title="<?php echo JText::_('K2_ADD_TO_REDDIT'); ?>" href="http://reddit.com/submit?url=<?php echo $this->item->socialLink; ?>&amp;title=<?php echo urlencode($this->item->title); ?>" target="_blank"><span><?php echo JText::_('K2_ADD_TO_REDDIT'); ?></span></a></li> <li><a class="stumble" title="<?php echo JText::_('K2_ADD_TO_STUMBLEUPON'); ?>" href="http://www.stumbleupon.com/submit?url=<?php echo $this->item->socialLink; ?>&amp;title=<?php echo urlencode($this->item->title); ?>" target="_blank"><span><?php echo JText::_('K2_ADD_TO_STUMBLEUPON'); ?></span></a></li> <li><a class="myspace" title="<?php echo JText::_('K2_ADD_TO_MYSPACE'); ?>" href="http://www.myspace.com/Modules/PostTo/Pages/?l=3&amp;u=<?php echo $this->item->socialLink; ?>&amp;t=<?php echo urlencode($this->item->title); ?>" target="_blank"><span><?php echo JText::_('K2_ADD_TO_MYSPACE'); ?></span></a></li>