yes Iam very serious to have a application(set of pages) in facebook where people will visit and which will be usefull I want to do something which will help people at Facebook a simple example is task management application where people add remainder
Current this is my plan on which Iam working but as this exists to having a duplicate one is of lesser use
What simeonvisser said is correct. Why do you not see and analyze the other user application that have many fans visitor and why they are interested in it. that is better for you get an idea. hope it is helpful.