I switched off my iPhone to watch Ingrid Goes West, and at the end I didn't want to switch it back on. Sure, central character Ingrid Thorburn (Aubrey Plaza) is a psychopath - stalking and manipulating her social media idols until they befriend her, and then causing mass destruction for everyone involved. But she also evokes some sympathy, as a lost and lonely girl, with a poor grasp on reality, who happily clings to Instagram as her only source of love. Her target, blonde California instagram It-girl Taylor Sloane (Elizabeth Olsen), is a shallow shell of a girl who has no concept that her breezy internet money making project - posting photos of her sunny, product-heavy life and chatting online to a stream of fake intimate friends - has any consequences in the real world. It's a cardboard cut-out of a world, but to a smitten Ingrid, Taylor is the perfect person. After Ingrid steals Taylor's dog to get the credit for its return, Taylor quickly and unwisely accepts Ingrid as her new BFF. From there, it's a black comedy of errors as Ingrid tries desperately to cling on to Taylor's ultra cool, partying clique, while hiding her rotten soul and her true identity. Ingrid proves willing to assault and lie to anything and everyone in her way. The most poignant victim is her sweet boyfriend Dan (Jackson O'Shea), who is much too trusting and giving to deserve her. She almost destroys him, but like a puppy he sticks with her. The movie's ending is daring and very disturbing, but I thought it makes sense. I laughed, despite the horror. It perfectly summarises the possible dangers of social media, in that creating fake versions of ourselves, and friending hordes of dodgy strangers - or in Ingrid's case, mistaking social media connection for real friendship - can be intoxicating, but also as toxic as rat poison. In the end, Ingrid vows to 'be herself' in future. But that realisation comes without any solid guidance or human support, and having no other aspirations, she's sucked In to playing yet another online obsessive - the victim seeking sympathy. No doubt generating her own deluded stalkers. Her phone is still a menacing weapon of mass destruction. The cycle starts again. I almost screamed - it was like the ending in Notes on a Scandal, where Judi Dench casually latches on to her next victim, like a tiger stalking its prey.