1. What goes into a school computer stays in a school computer. Don't write, click on, respond to anything that you wouldn't want your parents or director (principal) to see.
2. Just because you found info and pictures on the internet and not a book doesn't mean you don't have to cite your sources. The internet has a very casual feel to it. We browse and surf, copy and paste without realizing we are plagiarizing. Oh, and Google and Yahoo! are not sources!!
3. Bullying via Facebook, Instant Message, etc..., is just as real and damaging as bullying someone face to face. Enough said.
To teach digital citizenship I would form small groups and give each of them a few prepared roll-playing scenarios. They would then act them out and as a class we would pick what we thought were examples of good and bad citizenship. We would also come up with ways to better handle each situation.
They then sign their lives away via Faustian digital conduct contract.