One of my friends looked into slenderman and fears him or it. One day she looked in the mirror and thought she saw a black tuxedo on the door but then she saw a white face. She turned on the lights really fast and looked again but he was gone. I'd like to know, is there any history of sightings. If so, any recent ones? Basically, I'm just asking if he's real and if he is, why should I fear him? How does he choose his victims?