Unfriended

Unfriended is a movie starring Heather Sossaman, Matthew Bohrer, and Courtney Halverson. A group of online chat room friends find themselves haunted by a mysterious, supernatural force using the account of their dead friend.
While video chatting one night, six high school friends receive a Skype message from a classmate who killed herself exactly one year ago. At first they think it's a prank, but when the girl starts revealing the friends' darkest secrets, they realize they are dealing with something out of this world, something that wants them dead.