FBSDKShareKit : Share Form does not prompt

I just migrated to Facebook iOS SDK 4.0 (from 3.0).

Sharing content is now done using the FBSDKShareKit framework. I am currently using the following sample code as suggested by the documentation :

FBSDKShareLinkContent *content = [[FBSDKShareLinkContent alloc] init];
            content.contentURL = [NSURL URLWithString:@"http://www.apple.com"];
            FBSDKShareButton *button = [[FBSDKShareButton alloc] init];
            button.shareContent = content;

When I click on the button, I am redirected to the Facebook native app; but not sharing form is provided and nothing seems wrong according the console logs.

Notice that : * The App-Info.plist is well configured including FacebookAppId, FacebookDisplayName, as well as the URL types. * The AppDelegate.m class includes the appropriate changes as mentioned in Facebook documentation

Any reason why no form is prompted for the user to share the link?