Common Sense Media provides many great resources for educators to help address this topic and begin conversations in their classrooms. One thing that I really like about their resources is that they are not limited to just videos or scripted lessons, but also incorporate posters and resources to help educate families. When parents are involved, this helps reinforce concepts taught at school and helps families become connected with the learning environment.
If you are looking for some supporting resources for teaching digital citizenship, check out some of the great resources on Digital Citizenship from Common Sense Media's Pinterest site.