Some users have noticed settings that let Meta analyze and retain phone photos

"Facebook patent uses image recognition to scan your personal photos for brands" https://www.fastcompany.com/90333067/creepy-facebook-patent-...

"faulty pixels, lens scratches, other ‘camera artifacts’ and metadata within the image would be used to associate Facebook users with particular images. " https://www.imaging-resource.com/news/2015/09/18/facebook-wa...