Like a lot of mixed kids, I went through more than my share of identity crises and culture questioning. I'm pretty glad facebook wasn't around back then - I think these "quizzes" would have done a lot more harm than good.
Not that there's ever room for "...you think you're white. You are not, you are probably Asian" or "...85% Black... but you sometimes can act white or dress white" on the social networking scene. I'll just say this - if you need a quiz to qualify your race or ethnicity, let me know.