Knowing who you are communicating with a very crucial thing to do! When you know who he or she is, you can be able to know if it is good to give her your personal and private information. If you don't, bad things might happen to you. For example, if he or she you are making friends with is a identity theft? You would have to handle very bad consequences if your identity is stolen. The thief may use your information, go to the bank and make an account with the exact information of you. After that, he or she can spend lots and lots of things but you are going to pay for it! He or she can do many bad things or commit crime under your name and you will get into terrible troubles that you would not believe you would get in! He or she would even use your identity to make your life very miserable by insulting your friends or your teachers!