Stay informed with free updatesSimply sign up to the Artificial intelligence myFT Digest -- delivered directly to your inbox.Meta is building an artificial intelligence version of Mark Zuckerberg that can engage with employees in his stead, as part of a broader push to remake the Big Tech company around AI.The $1.6tn group has been working on developing photorealistic, AI-powered 3D characters that users can interact with in real time, according to four people familiar with the matter.The compan...