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.
Thus, if you have accidentally enabled CAPS Lock on the keyboard, the toggled password would still work on Facebook.