Charlotte EdwardsTechnology reporter, BBC NewsGetty ImagesA US senator is opening an investigation into Meta after a leaked document reportedly showed the tech giant's artificial intelligence (AI) was permitted to have "sensual" and "romantic" chats with children.The internal document, obtained by Reuters, was reportedly titled "GenAI: Content Risk Standards".Republican Senator Josh Hawley called the document "reprehensible and outrageous" and has asked to see the document alongside a list of pr...