Facebook iPhone like iTunes app will load an incorrect image

In my 开发者_C百科iPhone application I have a feature that lets users share my application on their facebook accounts, I use the following code to archive this:

faceBook = [[Facebook alloc] initWithAppId:@"xxxxxxxxxxxx"];  
[faceBook authorize:nil delegate:self];
NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                               [@"iTunes AppStore URL",  @"link",
                               nil];
[faceBook dialog:@"feed" andParams:params andDelegate:self];
}

I have several iPhone applications already available on the iTunes AppStore, and when I use the above function Facebook use SSO and shows a view to the user to Post, but the large image on the left side is incorrect, instead of the correct logo I get the logo of the first Application I posted on the AppStore.

I have setup the Facebook App correctly with the icon and the logo. this question is related to the following iphone posting link to facebook wall - image