Since I changed my mobile from iPhone to Android, Facebook refuses to recognize me. they demand an ID so I sent a drivers license copy. Then they demanded my selfie to ensure that I am indeed human. Fine, but they rejected my log in again.
There are two lessons, it seems to me. Facebook does not know who I am, and it may be a blessing because they cannot attribute the content to me. Second, the SNS is not all that important: although you lose the sense of being connected to someone, you get used to it quickly.