This aspect of digital citizenship, while it overlaps with others, still needs to be considered as an individual entity. Rights and responsibilities in the digital world refers to the freedom to express opinions, privacy, and to choose how much one shares (within reason), without being subjected to harassment or cyber bullying.
Reach Out has an excellent web page with plenty of information on cyber bullying. It is aimed at school students, so the language is easy to understand and doesn’t patronise. With short videos, as well as information, it is appealing for kids to explore.
There are of course, a plethora of resources on cyber bullying and generally being a decent person on the internet. It is crucial we arm students with the knowledge they need to be responsible for themselves and others online, such as how to take and save screenshots, and how to block people they do not want to talk to.