I love this site. It's like one of those ghost story books you can always get in the discount racks of Barnes and Noble.
Anyway if you're talking about the movie that I watched tonight, that was a mix of phenomenon. Some of it is internet phenomenon. Some of it is very real.
Shadow People a mix of both. Sleep paralysis real SUNDS-sudden unexplained death syndrome- strangely real in one place in the world... I don't think it's ever been outside of the tribes they originally touched on. There's probably other things that were real... there were real excerpts from some Nightmare documentary I've already forgotten what the credits called it.
Shadow people are those with alleged paranormal entity. They can also be described as persons with supernatural entities as those in the modern folklore. There are no consensus that the people are helpful or evil.