With a horror movie, you're making a metaphor. You're making a personalized nightmare for the protagonist.
For me, the social thriller is the thriller in which the fears, the horrors, and the thrills are coming from society. They're coming from the way humans interact.
With a horror movie, you want to know where the engine of the fear is coming from. Like in comedy, you want to know what the engine that's going to make the comedy - where that's coming from.
