The Night We Won't Forget

Five really close friends break into their high school one night. While exploring the school..they stumble across the basement, they go in and make sure to put a doorstop in it just to make sure they don't get locked in. They fool around a bit down there not really find anything so they decide to leave but on their way up the stairs they notice that the door was shut. They find themselves locked in the basement with no wifi and no phone signal. Accepting the fact that they are going to be in there all night they decide to explore a bit more. One of them finds a chalkboard on a desk, when they flipped over the chalkboard they all stared in disbeleif.. On top of the chalkboard was written all their names across it, underneath it said.. "EACH OF YOU IS HIDING SOMETHING FROM EACH OTHER." They are freaking out, at the very bottom it said, "IF ANY OF YOU FAIL TO TELL THE TRUTH BY MORNING YOUR SECRET WILL BE UJPLOADED TO YOUR SOCIAL MEDIA ACCOUNTS." Who knows their secrets? Who locked them in the basement? And will they make it out as friends?