What's that movie called ..?

It hasnt come out yet but its about these guys who are on facebook and meet this girl who they dont know and find a major surprise at the end. I remember the preview said " its not based on a true story or inspired by one, ITS JUST TRUE" or something like that and one of the critics said" the last forty mintues of the movie will freak you out" or something along those lines. The movie starts out all happy and cheesy, and gets mysterious. The movie is shot from a handheld camera, sorta like CLOVERFIELD was.. so i need help...