That information is considered hidden and cannot be found unless a part of Facebook's modding and admins it'self.
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It would be quite simple to find out how a fake account is. The fake account is usually made by someone who is pretending to be someone who think is funny, but actually that person is just being weird and could be a stalker in disguise. You can tell how the person speaks or acts on facebook. Then, you can compare how the actual person (whom the other person is in disguise on facebook) behaves and talks.
how do i know if i have more that 1 Facebook account
Not legally
You cannot find a specific bank with only an account number. However, you can find a bank if you have the routing number.
The checking account number is not located on the check. The number located on the check is the check number. If one wants to find their checking account number, they must call the bank to find out.