The wiki could provide a centralized database, which could be very systematically categorized, for the ease of searching and finding.
The existing situation now is: the jokes and questions are scattered here and there with numerous little pieces, it is impossible for 1 person to re-organize the old one, as well as to update all the new jokes, but the wiki style could do this job perfectly.
Something like 香港網絡大典：香港高登討論區 or 高登常用詞彙 could be a good example, tracing all the small funny sub-culture of HK, which are shaping and changing people around us.
As the jokes or IQ questions could evolve and develop into many different versions, the wiki could help to track back the origin and the development path.
For people who want to find some sort of cheers, this is a perfect website! This site could also be known as the Gag Encyclopedia (爛GAG大全).