First rule: Check your mood! Are you feeling upset or angry? Then it's not the time to be messaging or posting on a social media site. People don't always make good decisions or think straight when they're stressed out or upset. If you have to, call someone or go for a run instead before you start venting online.
Second rule: When you're on a website, try to remain as anonymous as possible. That means keeping all private information private. Private information that you should never allow the public to see includes:
your full name
any type of photograph (even of your pet!)
your current location (some phones have automatic GPS apps built in that may need to be turned off)
home or school address or the address of any of your family or friends
phone numbers
Social Security number
passwords
names of family members
credit card numbers
This information came from Nemours Teen Health, if you would like to read the rest of this article, the link is below!