The most popular topic would be the Uncategorized category, which has a whopping 11,817,405 questions as of October 18, 2014.
The next most popular category is the Math and Arithmetic category with 1,400,706 questions.
The third most popular category is the Celebrity Births Deaths and Ages category with 1,029,523 questions.
Going by questions and category contributions, Justin Bieber is the most popular celebrity on WikiAnswers with more than 57,500 questions in his category as of 2011.
The supervisors for the 'Questions about WikiAnswers' category are Kamuna and Dino10.
"WikiAnswers Local" is a placeholder category for questions about certain countries. No new questions should be added to the main "WikiAnswers Local" category.
As of July 18, 2010 the Justin Bieber category has the most questions, holding 126 pages of questions.
If popularity is measured by the number of questions per category, then the Chemistry category is most popular with over half a million questions.
At any given time, Uncategorized will most likely have the most flagged questions due to the sheer volume of questions in that category.
WikiAnswers has a category called 'Most Amusing Questions Ever Asked on WikiAnswers'. The category is home to many amusing questions that also goes under the category strange, unusual, weird, etc. Below is the link to the category.
You can find the most amusing questions in the 'Most Amusing questions ever asked on WikiAnswers' category. There is an entire category dedicated to amusing questions. Search for that category when you click the 'browse our ... categories' on the home page, and you should find that category.
We do have the category Questions About WikiAnswers and a category Questions about Answers.com Questions get put in misc or uncategorized when a user does not choose a category.
If you're looking for fun questions, look in the category 'Most Amusing Questions Ever Asked on WikiAnswers'. That category has the most amusing questions and answers! Otherwise, there are millions of great questions and finding the very best question may be a tough task.
There is no specific 'Jokes Category' on WikiAnswers. But there are two categories called the 'Humor and Amusemet Corner' and 'The Most Amusing Questions Ever Asked On WikiAnswers' where you can post cheesy questions or silly, but not inappropriate questions. (See related links for a link to the categories)
That would be WikiAnswers Local.