Not since "The Blair Witch Project" in 1999 has a horror film taken such a creative approach to conjure scares as "Unfriended." It's a cautionary tale of a group of friends who become the target of an unseen cyber-entity starving for revenge.
What makes this film so different is that it's shot looking at a computer screen. The actors interact through Skype, with back-story elements handled through online searches. Even the soundtrack is created using the tunes stored on one of the computers.