What should you do if............................…

what should you do if you know of a "person" on facebook that wants people to believe that they are a real person but many people do not think they are a real person. Many people at my school think that this "person" created a fake account in order to meet kids. I even have proof. someone at school asked him where do you go to school? He said the correct school. Who's your homeroom teacher? He said a real teacher at the school. What room number is it? He said "um I gotta go." That is just one reason why many person think that this is not a real person. What do you think we should do? What would you do? resides reporting them on Facebook and deleting them and ro blocking them. is there anything else we can do?