USENET newsgroup in the alt hierarchy, dealing with urban legends, and debunking or verification of dubious facts of all kinds. As their information archives will tell you, "it's a great place to get a reality check on anything 'a friend' told you".

alt.folklore.urban (also known as AFU) is characterized by a tightly-knit community, high standards of humor, skillful writing, low tolerance of smileys and other newbie cluelessness, and a special AFU jargon.