This has been going on for as long as high school has existed. Hell even way before that. The only difference is social media has amplified it. When I was in highschool it wasn't naked pictures being posted or anything like that, but more just gossip by a guy saying he had sex with some girl or a girl saying a dude has a small dick. etc. People are shitty to one another. Social media helps their shitiness get broadcast in new and exciting ways.