Quick tutorial on the flag module in drupal
The flag module can be used for many things on drupal. For example say you want users to be able to report a particular comment or post on your website, you can install the flag module and create a new flag called report spam and your good to go. It can also be used for flagging articles as say something like highlights on your website and then creating a view to display this flagged articles. The module also integrates with other modules such as rules and views bulk opertaion to create more intresting functionalities. Click on the video to learn more.