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Facebook SDK issue with login
- (void)login {
    HackbookAppDelegate *delegate = (HackbookAppDelegate *)[[UIApplication sharedApplication] delegate];
    if (![[delegate facebook] isSessionValid]) {
        [[delegate facebook] authorize:permissions];
    } else {
        [self showLoggedIn];
    }
}

- (void)login {

// Check and retrieve authorization information
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if ([defaults objectForKey:@"FBAccessTokenKey"] && [defaults objectForKey:@"FBExpirationDateKey"]) {
    facebook.accessToken = [defaults objectForKey:@"FBAccessTokenKey"];
    facebook.expirationDate = [defaults objectForKey:@"FBExpirationDateKey"];
}
if (![facebook isSessionValid]) {
    facebook.sessionDelegate = self;
    NSArray *permissions = [[NSArray alloc] initWithObjects:
                            @"user_likes",
                            @"read_stream",
                            //@"user_about_me",
                            //@"email",
                            //@"publish_stream",
                            @"publish_actions",
                            @"offline_access",
                            nil];
    [facebook authorize:permissions];
    //  [permissions release];
} else {
    [self showLoggedIn];
}
}