What to Do with Facebook Selfies
If when blocking your account, Facebook offered options for unlocking only send him a Selfie (a photo of the face), then it is better to send him a photo of the person's profile. on which the page was created.
Many arbitrageurs save photos after the first login to the account and then search for similar people through the Google service "search for similar people".
But you can send a random photo of a person by generating it on the site of unique images created using neural networks, such as:
Any of the two listed methods does not give a 100% guarantee of unlocking your account, even if you upload a real selfie of a person from your profile - this is not a guarantee of success. FB is a randomized machine.