The same applies to your family and friends. Never reveal anything about other people that could possibly get them into trouble. Remember, you never know for certain if people you meet online are who they say they are. If you do feel it's appropriate to meet with someone, discuss it with your parents and never go to the meeting by yourself. The safest procedure is to have your parents talk with the parents of the other person and for both of you to bring your parents along on the first meeting.
Some people write things that are mean or hostile.
It isn't your fault if you get a message like that, or if it makes you feel uncomfortable in any way. If you get such a message, don't respond. Instead, show it to your parents or a trusted adult to see if there is anything you can do to make it stop. Sending a response just encourages the person. Find Out What Your Parents Think About About Going Online.