Meet the Facebook Community Council, "a secret shadow organization of vigilantes who destroy the content of ne'er-do-wells and miscreants."
According to BoingBoing, the FCC take it upon themselves to keep the world of Facebook clean and all-American. It requires training, and once you're in the fold you look for the following:
-Nudity (such as "visibility of pubic hair or genitalia, the display of sex toys, and solicitation of cybersex")
-Drugs (especially promotion or use of "drugs illegal in the United States... This includes depictions of marijuana plants/leaf logos. This does not include the use of alcohol or tobacco...")
-Attacking ("direct attacks on non public figures")
-Violence (such as "visible mutilation of humans (including self-harm) or sadistic violence against animals... images of urine, feces, vomit, and semen.")
Lest cranks run wild, your list is then compared to others' and there needs to be some kind of consensus before someone's unceremoniously booted off the network. Clearly such measures are necessary: as BB tells us, among the most-reported complaints are "Gingers," "Chavs," and "Ginger chavs." It's becoming increasingly unsurprising that Facebook and Twitter-related topics led the list of "weird stories" for 2009: it's a jungle out there, and the Mad Maxes are, as usual, the scariest element.