The site is based on the ever more occuring fear of clowns, or Coulrophobia. According to a psychology professor at California State University, Northridge , young children are "very reactive to a familiar body type with an unfamiliar face". [Quote taken from Wikipedia]
The Why I Fear Clowns site also has a forum section, where you can get to know other users and share your scary clown stories that haunt you everywhere you go.
The forum section also has a Rank system that is directly based off of the amount of posts you make in the corresponding forum.
As well as having an Administrator running the whole Moti Network, Why I Fear Clowns also has a dedicated team of Moderators who see to that all users follow the rules and approve/reject the Submissions to the site.
UPDATE: As of 2016, Why I Fear Clowns is offline and its domain name is for sale. Its contents were not archived.