What are the essential Internet safety basics for kids?

Do
Ask your parents if you can use the Internet
Have basic social skills
Understand the site's rules and know how to flag other users for misbehavior
Recognize "red flags," like if someone asks you personal questions like your name and address

Don't
Go online without a parent's permission
Share passwords
Pretend to be someone else
Share personal details, like name and address
Be mean

(source: http://www.commonsensemedia.org/advice-for-parents/10-simple-steps-internet-safety)