You know what this is? Useless.

You may have done something bad. We’re not sure what, exactly, and we certainly won’t tell you, but here’s an email to make you feel vaguely uncomfortable.

Our systems indicate that you’ve been misusing certain features on the site. This email serves as a warning. Misuse of Facebook’s features or violating Facebook’s terms of use may result in your account being disabled. Thanks in advance for your understanding and cooperation.

Please refer to http://www.facebook.com/help.php?page=421 for further information.

The Facebook Team

Great work there, Facebook.