To use this feature, users must: take installation photos. They will then be analyzed by Meta’s AI to create images that are true to the user’s appearance. By typing “Imagine me” into a chat with Meta AI,no images will be created automatically and shared. This feature also allows you to create images of different sizes, from simple thumbnails to larger images suitable for posting on social networks.
Although this feature is optional requires prior activation in the app settings. Users have full control over the installation photos and can delete them at any time via the app settings.
Source : Wabetainfo