At DavidTennantOnTwitter we hold frequent quizzes about David Tennant.

All questions are tweeted by the account @DTQuiz so all replies must be tweeted to @DTQuiz too. (You do not have to follow the account in order to play.)

We started holding quizzes on 2nd May 2009 and quizzes have been held most weeks, sometimes twice in a week. The quizzes are usually 10 questions long but we have had them as long as 50 questions and once there was a treasure hunt around the Internet!

Some quizzes are about all the aspects of David Tennant's career but frequently there are specific quizzes like about certain episodes of Doctor Who or other productions which he has been involved in.

It's hard to tell how many people participate (and impossible to tell who is watching and not answering) but there can be 100-200 different names answering during each quiz, sometimes more.

Click here to see all the winners of the previous quizzes. Nowadays we play it so that the first person to answer correctly gets 10 points, the second gets 9 and so on. The overall winner and all the results are announced at the end of the quiz.

To answer a question, just start your tweet with @DTQuiz

One quiz tip is to keep your browser open on http://twitter.com/David_Tennant and keep refreshing the page. But don't break Twitter!