A new mechanism called the "social authentication" in Facebook. The said adds new security features and the new profile with to fight spam and prevent strangers from weaseling into your account. Sometimes the system will display the user headshot of a friend and asked to match names to faces. This multiple-choice photo quiz is a new take on a common Web system called Captcha in their registration or purchasing flows. The purpose of this test is to verify that you are a human being and not a computer trying to game the system. This new authentication in facebook will show you a few pictures of your friends and ask you to name the person in those photos. Cool hah..
I hate people who tag or send spam to me in facebook. Earlier this week Facebook CTO Bret Taylor said that the company focused and looking to cut down on spam in the system. They have succeeded in reducing spam by 95% in 2010.
To learn more about how to keep your information safe on Facebook and making Photo Tagging Easier, please visit the facebook blog