Once Facebook has data, it ends up in their database backups and potentially in their logs, and also potentially in CDN caches, so even if they deleted it from

Once Facebook has data, it ends up in their database backups and potentially in their logs, and also potentially in CDN caches, so even if they deleted it from their production database it wouldn't really be gone. This is one of those cases where it is impossible to prove a negative -- one can never prove that the data you gave to Facebook doesn't still exist somewhere, even if they look for it everywhere they can think of. Similarly, the company you entered into arbitration with might have made a good-faith effort to delete your data, but they might not have fully succeeded. Therefore, one must assume that any data given to any company might somehow survive even if the company attempts to delete it.