11 years ago today, Blizzard Entertainment inadvertently released a plague upon their World of Warcraft subscriber base when they introduced the raid boss Hakkar the Soulflayer, who infected players with a contagious disease that quickly spread throughout the entire virtual world.

One year ago today, Pakistani government worker Asif Raza Rana became an internet legend by publishing a hilarious announcement on Facebook that he had replaced his best friend, Mudasir. Since then, the men have reconciled and are once again close friends.

Fifteen years ago today, America's mainland was hit by the worst terrorist attack in world history, forever changing the course of America's future, the ripple effects of which still continue to resonate to this day.

In remembrance of the tragic terror attacks on September 11th, 2001, many share their memories of what they were doing at the exact moment they found out about the collisions with the hashtag #WhereWereYou.

In honor of Labor Day, revisit this series of charts depicting preconceptions of various career fields, which were nearly ubiquitous on Facebook in early 2012.