The only way to independently verify a leak is to have a third party create a couple of user accounts with unique passwords and setup a corresponding gmail / fa

The only way to independently verify a leak is to have a third party create a couple of user accounts with unique passwords and setup a corresponding gmail / facebook honeypot account which would alert them to logins. If my quoraAcct2 password ever gets hacked and used to login to my fake gmail or facebook account, I know that quora was compromised. Works with any site.