Laura receives a friend request from a student at her campus, Marina Mills. she accepts the request and begins a friendship with the lonely girl. she soon notices that Marina's Facebook profile is has many disturbing images and her obsessive behavior begins to make Laura feel uncomfortable.

Marina was ruthlessly bullied and tormented by the boys when she was seven years old.

when Laura unfriends Marina she offed herself and came back as a spirit

When Tyler and Detective Cameron are talking, Marina possesses Olivia through the heart monitor and lunges at Detective Cameron's officer, taking the gun from him, before killing him and vanishing

Laura receives a video call from her mother, Caroline who informs that she's been seeing Marina too. Laura's video call begins to glitch out as her mother begins to act strangely, a sign that she may be attacked by Marina. Caroline takes a knife from the table and goes to the other room, presumably killing herself as the connection times out. Devastated by her mother's presumed death, Laura begins to cry

Laura yells at Marina, asking what she wants from her, the spirit of younger Marina appears and says that she wanted to be best friends with her as she leads Laura to Marina's rotten corpse and her laptop which transports Laura into one of Marina's earlier posts. Laura is then lunged at by a demonic Marina.

Some time has passed and there are fresh batch of students. Laura is seen looking at some girls in the same way that Marina looked at Laura and her friends in the beginning

Laura then faces her laptop (which actually is Marina's laptop) and is shown to have zero friends, just like Marina before she met Laura. Then her new account, which shares the same dark, grotesque images and renamed as Lau Ra, is revealed. The camera shows Laura's eyes are green and blue, implying that Marina has possessed Laura