Unfriended appears to be the type of movie that you hear about or watch the trailer for and immediately have to begin mocking. "Oh wouldja look what Hollywood has done now? They're making a "there's a ghost in the internet" movie, oh how stupid." That's totally fair. It's fair to kind of hear about Unfriended and think "That sounds like a stupid movie" but I hope you like being wrong, because you are wrong because it's the opposite of stupid (i.e. "smart").
