Follow these safety tips :
Do not give out personal information such as your address, telephone number, parent's work address/telephone number, or the name and location of your school without your parents' permission.
Tell your parents right away if you come across any information that makes you feel uncomfortable.
Never agree to get together with someone you "met" online without first checking with your parents. If your parents agree to the meeting, be sure that it is in a public place and bring your mom or dad along.
Never send a person your picture or anything else without first checking with your parents.
Do not respond to any messages that are mean or in any way makes you feel uncomfortable. Talk with your parents so that you can set up rules for going online. You can decide upon the time of the day that you can be online, the length of time you can be online and appropriate areas for you to visit. Do not access other areas or break these rules without their permission.

Now you know how to be a safe online ! :D