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The standards themselves aren’t changing, but the details reveal some interesting tidbits. Photos of breasts are OK in some cases — such as breastfeeding or in a painting — but not in others. The document details what counts as sexual exploitation of adults or minors, but leaves room to ban more forms of abuse, should it arise.

Since Facebook doesn’t allow serial murders on its service, its new standards even define the term. Anyone who has committed two or more murders over “multiple incidents or locations” qualifies. But you’re not banned if you’ve only committed a single homicide. It could have been self-defence, after all.

Photo by Andrew Harnik / AP

Reading through the guidelines gives you an idea of how difficult the jobs of Facebook moderators must be. These are people who have to read and watch objectionable material of every stripe and then make hard calls — deciding, for instance, if a video promotes eating disorders or merely seeks to help people. Or what crosses the line from joke to harassment, from theoretical musing to direct threats, and so on.

Moderators work in 40 languages. Facebook’s goal is to respond to reports of questionable content within 24 hours. But the company says it doesn’t impose quotas or time limits on the reviewers.

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The company has made some high-profile mistakes over the years. For instance, human rights groups say Facebook has mounted an inadequate response to hate speech and the incitement of violence against Muslim minorities in Myanmar. In 2016, Facebook backtracked after removing an iconic 1972 Associated Press photo featuring a screaming, naked girl running from a napalm attack in Vietnam. The company initially insisted it couldn’t create an exception for that particular photograph of a nude child, but soon reversed itself, saying the photo had “global importance.”