IOS setInitialText method in SLComposeViewController iOS 8.3 does not show text in Facebook sheet

Question

The Facebook sheet appears but contains no text. I am using XCode 6.3.1 and iOS 8.3 on an iPhone 6. Thank you in advance.

My code is

SLComposeViewController *controller = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeFacebook];
[controller setInitialText:myStringObject];
[self presentViewController:controller animated:YES completion:nil];