One of the most commonly used modules for helping with a Drupal 7 site’s SEO is Metatag. A rewrite of the Drupal 5 & 6 module Nodewords, Metatag provides a flexible system for customizing the meta tags used on a website. Using various meta tags it is possible to exert some control over how search engines analyze each page, and how the content looks when it is shared over social networks.