Paramount says the Jason Reitman film, making its world premiere next month at the Toronto Film Festival, will open in limited markets on October 1. Pic will expand on October 10 and go wide on October 17th. Adapted by Reitman and Erin Cressida Wilson from the Chad Kultgen novel, the ensemble drama stars Kaitlyn Dever, Rosemarie DeWitt, Ansel Elgort, Jennifer GarnerJudy GreerDean Norris, and Adam Sandler as a group of high schoolers and their parents navigating life, love, and relationships in the age of social media and online obsession. The studio dropped a trailer earlier this week in a unique campaign with the Whisper app.