The Motion Picture Association (MPA) in the US has sent Meta a cease-and-desist letter over its use of "PG-13" when referring to content moderation on Instagram.
In October, the social media giant announced that teenagers using its platform would now only see content that abides by a PG-13 cinema rating.
Now, it has been told to "immediately and permanently" stop using the rating, with the MPA accusing Meta of being "highly misleading".
The MPA's film ratings, which range from G (general) to NC-17, are decided on by parents who watch the films and then evaluate them to come up with a rating.
"Meta's attempts to restrict teen content literally cannot be 'guided by' or 'aligned with' the MPA's PG-13 movie rating because Meta does not follow this curated process," the association's letter said.
"Instead, Meta's content restrictions appear to rely heavily on artificial intelligence or other automated technology measures."
The MPA is a US trade body that describes itself on its website as the "leading advocate of the global film, television, and streaming industry".
Naresh Kilaru, a lawyer for the MPA, said in the 28 October letter to Meta: "The MPA has worked for decades to earn the public's trust in its rating system."
"Any dissatisfaction with Meta's automated classification will inevitably cause the public to question the integrity of the MPA's rating system," Mr Kilaru said.
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The letter to Jennifer Newstead, Meta's chief legal officer, asked Meta to immediately disassociate Instagram's Teen Accounts and AI tools from the MPA rating system and to refrain from any use of the PG-13 mark.
It asked for a resolution by 3 November. On 6 November, however, Sky News checked and was still presented with a message on Instagram saying: "Instagram Teen Accounts will be guided by 13+ movie ratings."
Meta told Sky News that parents say they want to "better understand" what their teenagers are seeing on Instagram.
"To make things simpler for them, we updated our teen content policies to be closer to PG-13 movie standards - which parents already know," said a Meta spokesperson.
"We know social media isn't the same as movies, but we made this change to support parents, and we hope to work with the MPA to continue bringing families this clarity."
(c) Sky News 2025: Meta told to stop using PG-13 film-style ratings over Instagram content


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