Last week Facebook attempted to address a security and privacy flaw we helped report to them in conjunction with Michael Fury, the discoverer of the problem. Facebook's response was to email 6 million users, alerting them to an unexpected disclosure of their information and a brief explanation of the "bug" that caused it. As we had prior test data that verified the leak, we were in a position to compare what we knew was being leaked with what Facebook was reporting to their users.