As @KevinHoneycutt once said, "Our kids are growing up on a digital playground and no one is on recess duty."
CommonSense Education has a FREE curriculum available to teachers that covers things like Internet Safety, Privacy & Security, Cyberbullying & Digital Drama, Creative Credit & Copyright. Their curriculum is split up as K-2, 3-5, 6-8, and 9-12.
The lessons on CommonSense include clear objectives, a unit assessment and Common Core State Standards alignment. The detailed lesson plans include an Essential Question, Introduction, Teaching Points and Activities, and a Wrap-up. Any blackline masters or videos you would need to teach the lesson are also included.
Furthermore, each lesson includes a Family Tip Sheet and a Student Activity Sheet like these, both available in English or in Spanish:
Once you sign in and make a free account, you'll be able to access these high-quality resources (like this lesson on Cyberbullying for 3rd-5th Students) that will make teaching digital citizenship lessons a piece of cake.
Check out CommonSense Media...your students (and their parents/guardians) will be indebted to you!