Quiz website and facebook

Hi all ,

I need help about one website that i want to open .

I have check the thread about making money with quiz website and i come to idea to open .

what i want to do its on that website i want to ahve also the ranking for each member but the rankin should be worldwide and also between friend on facebook how should i do this ?

You should users register on your site and track their rankings among all the quizzes on your site