As per my observation the web apps that somehow relates its user to play with numbers and statistics have higher level of getting success rate then the ones that don't (not necessarily).
Use case: Stack Exchange has this reputation system which is one of the factor that we all love, apart from good info of course. Then, we had Orkut, which had only interactiveness but not anything like point system etc., then, Facebook came up with something like how many 'like', 'share'? etc which was smaller but number based tactic (I know it was not intentional).
My question is, if I am building a small n/w app for flower enthusiasts then would it be better if I make something on point system? Or is it ok to build just another n/w site just for interacting?
Opinion: I thought if we have something like points based system it attracts more users and it would have a reason for them to keep coming back to site.
Any answers with data is appreciated.
EDIT: We still have Orkut , sorry to use past tense :)