When you report an imposter account, Facebook will look into it and then act. Because impersonating accounts is prohibited by Facebook, when it confirms the account is phony, it takes steps to delete it. … It’s uncertain how long Facebook needs to investigate a fraudulent account report or who handles it.
When you submit a complaint, Facebook checks it for compliance with its Community Standards and removes it if it fails. The procedure for reporting and ultimately deleting a fraudulent account or an account impersonating someone else is exactly the same.
At the end of Q1 2018, Facebook disabled (and presumably deleted) 583 million phony accounts and detected and erased each one on average 11.7 days after that.
You cannot discover who alerted you to Facebook. Because if you knew who it was that reported you, it might be a problem.
