NEVER:
Agree to meet someone you only know from the internet
Give away personal information like where you live, your school, your full name, your house phone / mobile phone number, your email address.
Open an email attachment if you don't know who its from
Register for something without your parent's permission
Add someone you don't know in real life to your Friends List in an Instant Messenger like MSN or Bebo
ALWAYS:
Tell an adult if something on the internet makes you feel upset or uncomfortable
Tell an adult if someone asks for your personal information
Use privacy settings on Social Networking sites
THE REPORT ABUSE BUTTON
On most Social Networking sites or Instant Messengers there is a Report Abuse button. It looks like this:

So if somebody ever does something like asking for your personal information or asking you to send them pictures of yourself or anything else that makes you feel uncomfortable, click the Report Abuse button to get help.
For more information on how to stay safe online, go to http://www.thinkuknow.co.uk/