A character with such horror potential is instead butchered in the name of a z grade teen movie. Slenderman was summoned by the 4 lead girls because "tHe bOyS wErE dOiNg iT" with the following scene revealing the boys chickened out and wouldn't do it. This added nothing to the story as the boys didn't make any further appearances. So a whole 10 minutes of movie showed this to essentially state 'women tougher than men'. Female leads talking about porn before summoning slenderman.... followed by a large waste of time.
Very disappointing. You could have done anything with this film and you chose to make a teen drama with supernatural themes.