I think the most useful thing to have on the internet is common sense. If someone sends you something inappropriate you should know to stop and report them to parents or an adult. Almost 1/4 of all the kids on the web will receive a pornographic message  and 3/4 will not report it. If you are the victim of this COMMON SENSE will be there to help you find an adult. DO NOT EVER KEEP A SECRET. Common sense should tell you that if they want you to keep a secret then it is something that your parents don't know about. Common sense should also tell you that you never get something for nothing. They will most likely want  a nude picture of you and if this happens REPORT THEM IMMEDIATELY. Not everyone is who they say they are and these people will lie to you because they can hide behind a computer. NEVER arrange a face to face meeting with this person. They may try to hurt you or WORSE! That is why common sense is important.