This is interesting. You can log into your Facebook account using three passwords – one is the main password that you created and the other passwords can be constructed by toggling the case of characters that form your original password. 
For example, if your Facebook password is operati@nGeronimo!, you can convert the uppercase characters to lowercase (and vice-versa) and the toggled password string – OPERATI@NgERONIMO! – will also get you into Facebook.
There's another variation as well. If the first character of your Facebook password is in small case, just change that character to upper case – like Operati@nGeronimo! - and Facebook will gladly let you in.
You may try these variations with your own password on the Facebook login screen available at facebook.com/login.php.
A Stack Exchange thread pointed me to this ZDNet story that explains why Facebook allows users to login through multiple passwords. According to Facebook:
We accept three forms of the user's password to help overcome the most common reasons that authentic logins are rejected. In addition to the original password, we also accept the password if a user inadvertently has caps lock enabled or their mobile device automatically capitalizes the first character of the password.
Thus, if you have accidentally enabled CAPS Lock on the keyboard, the toggled password would still work on Facebook.
This story, Your Facebook Account has Three Passwords, was originally published at Digital Inspiration on 01/05/2012 under Facebook, Password, Internet.
Related posts:
- Choosing Different Passwords for Different Websites
- Keeping your Facebook Account Secure
- Creating Strong But Memorable Passwords with Inkblots
- Generate Strong Passwords with Wolfram
- Calculate the Strength of your Passwords Online
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