Facebook integration using Facebook Application in iphone
i have integrated `Facebook` using `library`in my previous app and its works fine without any issue. But now days i want to integrate facebook in my app using existing Application. 

When i click on `Facebook share icon` in my app it will check that you are already log in your `Facebook App` which is already in your `iphone`. If we are already `login` than `comment` will be post in our `Facebook Account`. Otherwise `Facebook App` will be open which is installed in our `iphone`. 

i have search but not getting any clue yet .
Plz suggest me How can i make this possible ? 

Thanks in Advance ...   
Facebook integration using Facebook Application in iphone
===

i have integrated `Facebook` using `library`in my previous app and its works fine without any issue. But now days i want to integrate facebook in my app using existing Application. 

When i click on `Facebook share icon` in my app it will check that you are already log in your `Facebook App` which is already in your `iphone`. If we are already `login` than `comment` will be post in our `Facebook Account`. Otherwise `Facebook App` will be open which is installed in our `iphone`. 

i have search but not getting any clue yet .
Plz suggest me How can i make this possible ? 

Thanks in Advance ...   