Digital Citizenship is the way a user behaves while on the Internet.  Being a Digital Citizen is being more than just a safe Internet user.  It's about being responsible, smart, and respectful.

Cybersafety is the "safe and responsible use of information and communication technology.  It is about keeping information safe and secure, but also about being responsible with that information, being respectful of other people online, and using good 'netiquette (Internet etiquette)'." (www.storypark.com/cybersafety)