"The aim of our social media channels is to create an environment where our community can engage safely in debate and is free to make comments, questions and suggestions", it said.
Abusive and even threatening remarks have become commonplace on the comment sections and Twitter feeds of the royal family, with Kate and Meghan, the wives of Queen Elizabeth's grandsons Prince William and Harry, particular targets.
The royal family's website said the guidelines were introduced to try to maintain a safe environment on channels run by the three households, and it called for users to show "courtesy, kindness and respect". Kensington Palace staff tasked with moderating comments will likely delete any posts that break the rules.
Social media trolls who post offensive or abusive messages on the royal family's platforms now face being blocked and may be reported to police under new guidelines published by Buckingham Palace, Clarence House and Kensington Palace.
They stated that comments must not be defamatory, obscene, threatening, or abusive; be discriminatory in any way; be "off-topic, irrelevant or unintelligible" or contain advertising.
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More than 7 million follow the Kensington Royal Instagram account, which is spruiking the new guidelines. It's worth remembering that Kate and Meghan have only ever been friendly and deferential to one another in public, that the "catfight" narrative between two influential women has always been a tabloid go-to, and that there's obviously no way either duchess would want their supporters publicly attacking their sister-in-law.
A senior Royal reporter had been threatened with having acid thrown in her face over her work, the ABC was told past year.
"People see their opinions as valid and I don't think they totally understand journalists do research, that the royals have a job to do".
While it's sad that this is a necessary move from the palace, it's about time that the barrage of online abuse is taken a little more seriously.