Autofill is not some feature that will work in the way which we normally envision it to, for example, when you are typing your name and the full name appears automatically. No sir, Autofill by Facebook intends to make online transactions on mobile devices a whole lot easier and quicker, but there is a catch – the Autofill option can only be accessed via an extremely limited number of Facebook users, with a few selective retailers being made available on its store at the moment. Facebook intends to expand the Autofill option to all Facebook users in due time as long as it becomes more popular. Basically, it is a function that saves your credit or debit card credentials to be linked to your Facebook account for faster verification.