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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.
The first Internet references to Slenderman appeared during a June 2009 Photoshop content on Something Awful, a comedy website. Eric Knudsen posted two black and white photos of children playing with the Slenderman character Photoshopped into the background, Know Your Meme explains.