I've been a member of quiz site 'Sporcle' for a couple of years, on and off. It's a fun and rather addictive site with thousands of quizzes of different types. If you join the site (for free) you can earn badges and do challenges against other Sporclers or the Sporclebot. You can comment, rate and even submit your own quizzes!

https://www.sporcle.com

Bomp!

I love taking quizzes! I'll check this out :)

I have a Sporcle account. I kick ass at the US State-naming one :D