Meghan Markle and Kate Middleton are suffering torrents of abuse online.
Violent threats have been made against the women and some of their fans.
Kensington Palace is struggling to monitor the comments on their social media, a source revealed.
They have even enlisted Instagram to help.
A source told HELLO!: “The Palace has always monitored comments but it’s a hugely time consuming thing.
“They can block certain words, but some of it is quite serious.
“Over the course of last year, with hundreds of thousands of comments, there were two or three that were violent threats.”
The source said there was little that the palace can do to stop the unpleasant behaviour.
“You can delete and report and block people and the police have options around particular people. It’s something you have to manage because there’s no other way to control it,” they added.
“It follows a Kate vs Meghan narrative and some of the worst stuff is between Kate fans and Meghan fans,” the source continues.
“Arguments about who looks more appropriate, for example, that turn into personal attacks on other users. It’s creating a supercharged atmosphere and everyone can join in, but what are the consequences of this?”
Kate has been called “boring” on multiple occasions.
HELLO! claim when Meghan made a surprise appearance at the British Fashion Awards, moderators had to disable comments on an Instagram post and delete more than 500, because the debate became so abusive.
It claims Meghan has been criticised for “faking” her pregnancy to get attention, trying too hard, walking strangely, touching her baby bump too much, and being too slim.