If you use Facebook, then you've probably seen the quizzes. There are dozens of them, and they are popular. You can easily spot them because they have similar titles: "What [blank] are you?" or "Analyze Your [blank]." Invariably, the quizzes collect your personal information, and often that of people you are connected with.
How accurate are these quizzes? Below is a clue, including the results after a user submitted their (unique) profile photo for analysis: