Unusually for a teen horror, Unfriended delivers decent old-fashioned chills. Dare you peek between your fingers at… the haunted Skype chat?Are we living in an interesting era for horror movies, or is there currently just a glut of them? It Follows was playing in the same multiplex as Unfriended, which itself was preceded by trailers for The Gallows, Insidious 3, The Visit and the Poltergeist remake, one or other of which was advertised as being “from the producers of The Purge and The Grudge”.