This is a quote by someone named Maria who explained it.  

Y'all better hold onto your butts bc you're going to get as triggered as me. Today I shall spread awareness.  So, apparently there's this website called Blue Whale. When you sign up you are assigned an anonymous "master" who gives you daily challenges. Some of these include self harm, watching horror movies, and waking up at unusual hours.  Every day the challenges get increasingly difficult. Then on the fiftieth day, the "game" makes you commit suicide. Around your fortieth day of playing,your master urges you to download the app, and typically, if you refuse, they threaten you (most commonly to kill your parents). Once the app is downloaded, the people behind Blue Whale then hack your phone and make it impossible to delete the app. That clearly means they have all your information. Around 130 deaths have already occurred in Russia, with people jumping off buildings and throwing themselves onto train tracks. It is said that people post pictures of a blue whale or carve it onto their body before they kill themselves. Basically, Blue Whale is a sick social media "game" that everyone should stay away from. If you know anyone already using this app, stop them right now. 

Tag people you know and get them to spread awareness.