It seems like I have successfully protested to the use of my texts and photos for the training of Meta's generative AI on both Fb and Instagram. In both cases I posted a short text more or less like this: "I am on principle against the use of other people's copyrighted material for the training of generative AI, and strongly protest that my text and photos are used for such training." Feel free to re-use that. For whatever good it might do.