diferença entre índice, seguir ou seguir
<meta name="robots" content="index, follow">
<meta name="robots" content="noindex, nofollow">
<!--
Follow means : page will be crawled.
No Follow means : page will not be crawled.
Index means : your page show in search results.
No Index means : your page does not show in search results.
-->
Mushy Manatee