I have a friend whom I owed money from. I still owe him the money but what he did, he posted a picture of me with captions stating to pay him the money and he even send that picture to some of my family members and to our common friends. He even created another fb account with a different name but with some of my picture including the same caption. He added some of my schoolmates in highschool. My schoolmates send me a copy of the message and asking me who is the person defaming me. I was really embarrassed and felt harassed.
Please advise me on what I can do to this person.