The Slender Man is an alleged paranormal figure purported to have been in existence for centuries, covering a large geographic area. Believers in the Slender Man tie his appearances in with many other legends around the world, including; Fear Dubh (or, the Dark man) in Scotland, the Dutch Takkenmann (Branch Man), and the German legend of Der Großmann or Der Grosse Mann (the Tall Man).
The Slender Man is a being (male in appearance) who looks like a man with extremely long, slender arms and legs. He also appears to have 4 to 8 long, black tentacles that protrude from his back, though different photographs and enthusiasts disagree on this fact, and therefore it is theorized he can 'contract' these tentacles at will.
He is described as wearing a black suit strikingly similar to the visage of the notorious Men In Black, and as the name suggests, appears very thin and able to stretch his limbs and torso to inhuman lengths in order to induce fear and ensnare his prey. Once his arms are outstretched, his victims are put into something of a hypnotised state, where they are utterly helpless to stop themselves from walking into them.
Whether he absorbs, kills, or merely takes his victims to an undisclosed location or dimension is also known as there as there are never any bodies or evidence left behind in his wake to deduce a definite conclusion.
Much of the fascination with Slender Man is rooted in the overall aura of mystery he is wrapped in. Despite the facts that it is rumoured he kills children almost exclusively, it is difficult to say whether or not his only objective is slaughter.
It is often thought as well that he enjoys stalking people who become overly paranoid about his existence, purposefully giving them glimpses of himself in order to further frighten them. For this reason, it seems like Slender Man very much enjoys psychologically torturing his victims.
His main intention appear to be kidnapping children, as when he is seen near them in photographs, they usually disappear shortly afterwards.
In the end though, his purpose remains unknown
An interesting take on Slender Man by a pasta member who is relying on the Marble Hornets for evidence/facts:
"There has been a bid misconception about my pal Slender Man due to the appearance of this article. He does not have hair or a face. Everything else is correct. There is also some questioning as to whether or not there is more than one. I find that unlikely. It's most likely Slendy fucking with your head in order to make you think that there is more than one, which he has been known to do."

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Scary Stories!
TerrorHey, did you see that. That white figure or that poltergeist. All the stories that will scare the average person. Also tell me what stories I should put in this book. Thanks!