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//Cria o ComposeViewController
SLComposeViewController *facebookViewController = [SLComposeViewController composeViewControllerForType: SLServiceTypeFAcebook];

//Cria o Texto inicial
[facebookViewController setInitialText: @"Foto Bacana"];

//Cria a imagem a ser compartilhada
[facebookViewController addImage: [UIImage imageNamed:@"foto.png"]];

[self presentViewController: facebookViewController animated: YES completion: nil];