This is how Facebook defines “Login Approvals”

What are login approvals?
Login approvals use text message (SMS) confirmations to make it harder for unauthorized people to use your account.

How it works?
When you try to log in using unrecognized computer, you’ll have to enter a security code that we text to your mobile phone.

“Login Approvals” is a security feature of Facebook that requires two-factor authentication from the user before user can access his account. Instead of just using a password, the user must input a verification code which is sent to their mobile. The “Login Approval” is a useful feature implemented by Facebook, just like google’s “two step verification” feature. However, it can become a problem if your phone is lost or you have no access to your phone. For example, if you travel to an area with no mobile reception, you will not be able to receive the code that allows you to access to your Facebook account. In short, If you don’t have your phone, you will not be able to login to your Facebook account from a new computer. However, you can still login to your account from a computer that has already been authorised. Two-Factor Authentication seems to be the next big thing to protect accounts from unauthorized access.

How to enable Two-Factor Authentication of your Facebook Account

Step 1: Login to your facebook account.

Step 2: Click on the arrow (at top right), a menu will appear and then click on “Account Settings”.

 

 

Step 3: From the Left Menu, click “Security” link.

 

 

Step 4: From the “Login Approvals” row, click edit

 

 

Step 5: Select “Require me to enter a security code each time an unrecoginzed computer or device tries to access my account.”

 

 

A new popup will appear.

 

 

Step 6: Click “Set Up Now” button

Step 7:  Before you can use this featured, you need to add and verified your phone number to your facebook account.

Choose your country, add your phone number and click “Continue” button.

 

 

You will receive a verification code shorty on your phone.

Step 8: Enter your verification code in the input box and click next.

 

 

Step 9: Enter your computer name. Facebook will add this computer to your recognized device.

 

Click next.  That’s It.

Now, whenever you login from an unrecognized device, facebook will sent verificaiton code to your mobile, which you will have to enter to login to your account.

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