After several teenagers on Skype are tormented by a supernatural entity, the ending to the 2015 horror movie, Unfriended, is just as dark as the rest of the story. Blaire Lilly (Shelley Hennig), her boyfriend Mitch Roussel (Moses Storm), and their friends, Val Rommel (Courtney Halverston), Ken Smith (Jacob Wysocki), Adam Sewell (Will Peltz), and Jess Felton (Renee Olstead) are confused as to why someone named billie227 is part of their group chat – which sets up the paranormal twist. While there are many films that use the screenlife format, Unfriended still stood out thanks to the cast's performances and writing.

https://screenrant.com/unfriended-ending-explained/