.....
.....

<li>
      <a href="http://www.facebook.com/sharer.php?p[url]=<?php echo $page_url_to_share; ?>" target="_blank">
             <i class="fa fa-facebook" aria-hidden="true"></i>
      </a>
</li>
<li>
      <a href="http://twitter.com/share?url=<?php echo $page_url_to_share; ?>" target="_blank">
             <i class="fa fa-twitter" aria-hidden="true"></i>
      </a>
</li>

.....
.....