In Django, when you create a relation using ForeignKey or a ManyToManyField, a corresponding backward relation is automatically created for you. This backward relation gets a reasonable default name. If you’d rather use a different name, you can specify one with the related_name parameter.
The recently introduced Send button, just like the original Like button, gives Facebook the ability to track the web pages you visit while being logged in to their site. Since I don’t like to surrender this kind of information, I chose to filter away the Like and Send buttons.