In this case probably more anti-internet. Creepy pasta stories are entertaining but some people obviously take them too seriously. I have watched most of the Marble Hornets Slenderman series on YouTube.
I've heard that slenderman is a real legend, not just internet made up. I've heard he grabs people and ties them down and asks them a question "What is my name?". If you get it right then he cuts loose a log that is hanging over your head, and if you get it wrong then he slides his fingers down your throat to your heart and rips it out.
Unfortunately things like this often end up becoming anti-video game campaign material (in this case because of Slenderman).