Websites use CAPTCHAs to identity whether user is a human or a machine because hackers crashes websites and steal your information. Therefore CAPTCHAs are awesome solution for websites. But Facebook is going to give you an advanced and creative security solution instead of CAPTCHAs. Its called Social Authentication. This is still under experimentation. Facebook is going to test Social Authentication and collect user’s feedback soon.
What is Social Authentication ?
Someone can hack your password but they do not know who your friends are. Therefore Facebook is going to show you some friend’s pictures and ask you to name the person in those photos from 6 names.