Most of the comments here talking about bad actors using this for misinformation, but they're ignoring what Meta does- it collects your information and it sells ads.

Especially based on the examples on this site, it's not a far reach to say that they will start to generate video ads of you (yes, YOU! your face! You've already uploaded hundreds of photos for them to reference!) using a specific product and showing how happy you are because you bought it. Imagine scrolling Instagram and seeing your own face smelling some laundry detergent or laughing because you took some prescription medicine.