Facebook uses this, to avoid login errors which are generally caused by keeping CAPS lock on while entering password. You can log in to your Facebook account by three passwords, one which is generated by you and another which are generated by Facebook itself, toggling the case of characters.
Let’s understand this with help of example.
Say you have password for your Facebook account as
Here the characters F,K,P are in upper case and all other characters are in lower case. This is your first and own generated password. You always use this. The remaining two passwords which are generated by Facebook are as Follows.
The second password can be obtained by altering the case of characters. That means, you simply replace all upper case characters by lower and all lower case characters by upper. Put your password at Facebook login screen and hit enter. You will be logged in.
As lots of users use Facebook from mobile also, Facebook creates a special password for mobile device. For mobile device, Facebook do not consider case of first character. Whatever it may be, in lower case or in upper case, Facebook will log on you to your account.
Since many mobile phone automatically capitalizes the first character of the password. This may lead to log in errors. Here as shown in above image, even if your password is “myFacebooKPassword”, then you can use “MyFacebooKPassword” while logging in to your Facebook account.
You may try these variations with your own password on the Facebook login screen available at facebook.com. Except this three, non of the other variation can be used for logging in purpose.
According to Facebook:
Password 1 (User Generated)
Here the characters F,K,P are in upper case and all other characters are in lower case. This is your first and own generated password. You always use this. The remaining two passwords which are generated by Facebook are as Follows.
Password 2 (Altering cases)
Here in above image you can clearly see that case is inverted. f,k,p of password is in lower case while the remaining characters are in upper case. Facebook creates this password to avoid login error which are caused due to leaving CAPS lock on while entering the password. So if your password is “myFacebooKPassword” then you can also use “MYfACEBOOkpASSWORD” for logging in.
Password 3 (For mobile only)
Since many mobile phone automatically capitalizes the first character of the password. This may lead to log in errors. Here as shown in above image, even if your password is “myFacebooKPassword”, then you can use “MyFacebooKPassword” while logging in to your Facebook account.
You may try these variations with your own password on the Facebook login screen available at facebook.com. Except this three, non of the other variation can be used for logging in purpose.
According to Facebook:
Thus, if you have accidentally enabled CAPS Lock on the keyboard, the toggled password would still work on 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.
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