Look at the first photo of a friend, then examine every one of your friends (the average user has a couple hundred) and match them up, assuming that their profi

Look at the first photo of a friend, then examine every one of your friends (the average user has a couple hundred) and match them up, assuming that their profile photo is similar to the randomly-selected photo from the social captcha The example posted on the FB site looked like a multiple-choice selection was to be made, so the putative hacker would only have to look up those six friends, not look through all of your connections.