Common Sense Media offers this poster for younger children. A way that I might help youngsters remember the five areas would be to hold up five fingers and think of the acronym BRPPSS (sounds like burps): 
1. Balance
2. Respect
3. Protect Privacy
4. Safety
5. Stand-up to Bullying

www.commonsensemedia.org
offers parents and educators many resources for helping children be safe online. Here is a poster that may be downloaded or ordered from their site. The flow chart helps students follow a protocol when they want to post photos of themselves or others. I think that it is a great guide for teenagers.

Educators, whom I have been lucky enough to know and work with, always have their antennae up for ways to improve student learning. While at a workshop recently with Mary Ellen Caesar from the Massachusetts Department of Elementary and Secondary Education (http://literacyplate.blogspot.com), I learned about one such resource, which offers ideas for helping children present their thoughts and build upon others’ points of view.

Jeff Zwiers and Marie Crawford, from the University of San Francisco and the University of Southern California have published Academic Conversations, which offers explicit ways that teachers can help all students improve their ability to communicate. Their clear prompts for questioning and responding are presented in this chart.