i used to see a lot of application requests from my friends, but haven't seen a single request in the last few months. what's going on? are facebook apps not d

i used to see a lot of application requests from my friends, but haven't seen a single request in the last few months. what's going on? are facebook apps not doing well? or are my friends just not installing apps anymore? is this the same thing that's gonna have to the iphone?