Even though my High School is widely known throughout its county for having multiple fights between the students every day, as well as the terrible restroom and cafeteria food quality there, the one thing of notable importance that happened took place during my Senior Year...
During the final semester of my senior year, a random student took a snapchat picture posted by one of my friends and added his own caption to it exclaiming that he (my friend) was going to shoot up the school the next day. While I don't remember what day it was, I do remember that the student posted the newly captioned image on either snapchat or instagram (I don't remember which, but it was most likely on snapchat) and it soon spread far and wide to basically every student and teacher that went to the school. After a few hours, this was brought up to the Police, who decided to investigate the situation by detaining my friend the next day at his house so that they could question him about it. On that day, over half of the students remained home in fear of an actual school shooting...and since my school is as it is, they were punished for staying home rather than going to school that day.
I did end up being the one of the few that went to school, as my parents could care less about there being a shooting, and it was peacefully calm and quiet that day due to the lack of students...as normally people would be running and yelling through the halls, so that's something I didn't complain about. Anyways, as life began to go on as normal, my friend was kept out of school (or at least out of class) for the next week for questioning until the person behind the post was found and punished for their cause of panic throughout the school. Since then, the school has been kinda strict about what people post when referring to the school and its staff and students, but it has been around a year since this occurred, so I can't say for sure what the school's policies are about it now.