QuizMEOnline

QuizMEOnline is a great new social network for students.  This site is ideal for creating quizzes, flashcards, and study guides and then sharing them w/ others.  Another nice feature is the ability to create a study group or class and then share things w/ them.  Also, a user has a number of privacy controls on who can/can't see their quizzes.

I highly recommend checking out QuizMEOnline by clicking here.

For another nice site for creating collaborative quizzes check out Gnowledge.