The letter was signed by 33 animal welfare organizations from around the world on behalf of the Social Media Animal Cruelty Coalition
(www.smaccoalition.com/) and calls on Meta to do more to remove torture and abuse content and users who share it from the platform.
The content refers to the BBC documentary that exposed international networks of animal abusers creating, selling, and consuming content about the violent torture of macaques on social media.
You can find the documentary here - but beware, it's not for the faint of heart: