A Twitter person once said that a lady was saying some stuff in a plane. Several Democratic Underground members believed the story (which turned out to be fake). In these two DU threads, nobody bothered to wonder whether the tweets were true or false:
Thread #1: http://www.democraticunderground.com/10024114375
Thread #2: http://www.democraticunderground.com/1018525942
Because you know, if someone tweets something it must be true!
Moral of the story: Do not rely on DU for information.