BrainPop is an app that can teach Digital Citizenship section. There are many topics it discusses, including cyberbullying, internet searching, online safety, information privacy, peer pressure, plagiarism, and social media. Each category contains links to videos, challenges, quizzes, games, activities, and readings. This provides students with lots of resources and they can learn about the topic in a variety of forms. Then there are resources for teachers below for different grade levels.
Schoology is similar to Google Classroom. Teachers can create dynamic lessons that can be differentiated and progress can be tracked. Schoology can also be used to communicate with students, parents, and other teachers in private messages. https://www.schoology.com/k-12/instructional-tools