How do I know if someone deleted their Facebook account?

Related questions

1. Is archive org public domain?
2. Can you still see a deleted facebook account?
3. Why is my deleted Facebook account still visible?
4. How long can I leave my Facebook account deactivated before it's deleted?
5. Is Wordpress A archive?
6. Why do I get content not available on Facebook?
7. Does Facebook delete accounts if not used?
8. Can message someone on Facebook but can't see their profile?
9. What happens when you are blocked on Facebook?
10. Who owns the Internet Archive?

Tags

1. #cannot
2. #friend
3. #profile
4. #their
5. #account
6. #person
7. #either
8. #result
9. #blocked
10. #search
11. #deactivated