“Killer Content” (*1/2 out of four) was a killer mistake about a deranged fan (Casey Casmira) who invades the home of her favorite social media star (Katie Keene) and plans to film her home invasion to become a social media star but doesn’t count on the star being an even bigger psycho than she is and turning the tables and holding her hostage. Potentially intriguing and ironic material about social media and stalking is blunted and bungled by ham-handed attempts at dark humor and irritating overacting. You can only imagine what Scorcese or Fincher would have done with juicy material like this.