Don't give out or post personal information about yourself or anyone else. Personal information includes your phone number, address or full name.
Keep your account IDs and passwords private!
Delete emails from people you don't know and never open attachments or click on a link from someone you don't know. They could contain destructive viruses.
Have spyware and anti-virus software installed on your computers.
Communicate responsibly. Take the following as a good rule of thumb: if you wouldn’t say it to someone’s face, don’t e-mail it, instant message it, or post it as a comment on someone’s page. The same is true with photos. Don't post anything you wouldn't want everyone to see.