How to apply Open Graph in this code:
<div class="col-md-4">
<ul class="nav">
<li class="item-rede-social">
<a rel="facebook" href="">
<img src="imagens/facebook.png" class="img-responsive" alt="facebook"></a>
</li>
<li class="item-rede-social">
<a rel="instagram" href="">
<img src="imagens/instagram.png" class="img-responsive" alt="instagram"></a>
</li>
<li class="item-rede-social">
<a rel="twitter" href="">
<img src="imagens/twitter.png" class="img-responsive" alt="twitter"></a>
</li>
</ul>
</div>