They stand in sharp contrast to the United States’ First Amendment protections of free speech, which courts have interpreted to allow exactly the sort of speech and writing censored by the company’s hate speech algorithm. Kill them all.” Higgins’ plea for violent revenge went untouched by Facebook workers who scour the social network deleting offensive speech.For instance, Higgins’ incitement to violence passed muster because it targeted a specific sub-group of Muslims — those that are “radicalized” — while Delgado’s post was deleted for attacking whites in general.(The exact rules are in the slide show below.) Facebook has used these rules to train its "content reviewers" to decide whether to delete or allow posts.Facebook says the exact wording of its rules may have changed slightly in more recent versions. Behind this seemingly arcane distinction lies a broader philosophy. The post was removed and her Facebook account was disabled for seven days. But a May posting on Facebook by Boston poet and Black Lives Matter activist Didi Delgado drew a different response. Start from this reference point, or you’ve already failed,” Delgado wrote.Over the past decade, the company has developed hundreds of rules, drawing elaborate distinctions between what should and shouldn’t be allowed, in an effort to make the site a safe place for its nearly 2 billion users.The issue of how Facebook monitors this content has become increasingly prominent in recent months, with the rise of “fake news” — fabricated stories that circulated on Facebook like “Pope Francis Shocks the World, Endorses Donald Trump For President, Releases Statement” — and growing concern that terrorists are using social media for recruitment.The slide identifies three groups: female drivers, black children and white men.It asks: Which group is protected from hate speech? The reason is that Facebook deletes curses, slurs, calls for violence and several other types of attacks only when they are directed at “protected categories”—based on race, sex, gender identity, religious affiliation, national origin, ethnicity, sexual orientation and serious disability/disease.