Why “Follow, Index” and “Revisit-After” Robot Tags Are Useless
Sometimes we see on source code’s head section a lot of Meta tags like:
* <META name="revisit-after" content="15 days">
* <META robots="follow,index">
Both are useless (or obsolete to say the least).

* <META name="revisit-after" content="15 days">
Search engines don’t use this as a basis for them returning to your website. They’re more sophisticated than this tag, even if you update your site exactly every 15 days. If your site does not have anything new in recent memory, search engines will optimize its resources and could skip your site in favor of more often updated sites. The reason is that search engines don’t find anything new content to index. In order to impose a similar directive to search engines, you can implement XML sitemaps, including .






