Erin Lee Carr’s latest documentary ‘Fanatical: The Catfishing of Tegan and Sara’ investigates the mystery of ‘Fake Tegan’, a hacker who has been terrorizing the legendary band for over 15 years.Tegan and Sara open up about being catfished and the dangers of internet culture in their documentary 'Fanatical: The Catfishing of Tegan and Sara'