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Slenderman is fictional character that appears in online ghost and horror stories. He's described as a tall, thin man with a blank face and tentacle-like arms. Urban legend maintains that Slenderman preys on children and has teleportation powers.
(Says the wiki: a creepypasta is a short story posted on the Internet that is designed to unnerve and shock the reader.) There are hundreds of Slender Man stories on Creepypasta, most of which seem to focus on the protagonist being hunted by the tall, cloaked, shadowy figure.