Broad license to user content
You are agreeing to let Meta share, copy, and sublicense your content to other companies and users.
“you grant us a non-exclusive, transferable, sub-licensable, royalty-free, and worldwide license to host, use, distribute, modify, run, copy, publicly perform or display, translate, and create derivative works of your content (consistent with your privacy and application settings). This means, for example, that if you share a photo on Facebook, you give us permission to store, copy, and share it with others... such as Meta Products or service providers that support those products and services.”
What that means: You lose exclusive control over your photos and videos, allowing them to be shared widely even after you stop actively using the service.
The document grants Meta extensive rights to your content, including the ability to sublicense and distribute it to third-party service providers, far beyond what is strictly necessary to function the app.