There was a horrible video that was being shown on Snapchat out of Clarence. The video, which is not posted here out of respect for the victim, saw multiple people attacking a teen boy and resulted in serious injury.
Snapchat is a clever little app. It basically lets people add captions and draw all over pictures then send 'em to fellow Snapchatters. There are plenty of times this could (and does) get sorta weird, but there are also really clever users who go the creatively funny route.