Who: This is a module for all Drupal Admins, technical, non-technical What: The flag module allows you to flag content, users, etc with flags that you define. They can be per user or global. When: Use this module when you want users to be able to flag content. This will allow your users to create bookmarks (non-browser), mark material as inappropriate or pretty much whatever you can think of. Where: /sites/all/modules Why: It allows your site to be more dynamic by letting your users flag content in the ways that you want them to.
