FBML provides some very useful tags for displaying both messages and errors to your application’s users. These tags will display a standard Facebook error or message, using Facebook’s style guidelines. It is strongly recommended that you use these tags for errors and messages because they keep the Facebook look and feel consistent within your application. This section is a list of tags that will render standard Facebook errors and messages. I’ll provide examples and images for each tag so you can see what they look like in real life.