http://excya6cvdfpgspsf57w42mvyd5mzthi34l6eopqkhxg67y7wp6qry6qd.onion/verify-an-email-address-on-facebook.html
To get the username the only that you must do is access to the profile. Once you accessed, you will see the profile URL in your browser. Something like this: In the example obove, the URL is: https://www.facebook.com/charles.black55 , so the profile's username is: charles.black55 Sometimes, the URL can be longer, because it can include some others parameters.