Sharing on Facebook, Twitter and Google+

[FIXED]     Font of navbar.
[FIXED]     A few compile fixes.
[IMPROVED]  Made properties nonatomic.
[ADDED]     Support for facebook, twitter and google+ sharing.

External/google-plus-ios-sdk/SampleCode/GooglePlusSampleShareViewController.h

@@ -0,0 +1,50 @@
+//
+//  GooglePlusSampleShareViewController.h
+//
+//  Copyright 2012 Google Inc.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//  http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+//
+
+#import <MessageUI/MFMailComposeViewController.h>
+#import <MessageUI/MessageUI.h>
+#import <UIKit/UIKit.h>
+#import "GooglePlusShare.h"
+
+// A view controller for the Google+ share dialog which contains a text field
+// to prefill the user comment, and a text field for an optional URL to share.
+// A Google+ share button is provided to launch the share dialog.
+@interface GooglePlusSampleShareViewController : UIViewController<
+    GooglePlusShareDelegate,
+    UITextFieldDelegate,
+    UIActionSheetDelegate,
+    MFMailComposeViewControllerDelegate> {
+  // The Google+ share object to manage the share dialog.
+  GooglePlusShare *share_;
+}
+
+// The text to prefill the user comment in the share dialog.
+@property (retain, nonatomic) IBOutlet UITextField *sharePrefillText;
+// The URL resource to share in the share dialog.
+@property (retain, nonatomic) IBOutlet UITextField *shareURL;
+// A label to display the result of the share action.
+@property (retain, nonatomic) IBOutlet UILabel *shareStatus;
+// A toolbar to share via Google+ or email.
+@property (retain, nonatomic) IBOutlet UIToolbar *shareToolbar;
+
+// Called when the share button is pressed.
+- (IBAction)shareButton:(id)sender;
+// Called when the toolbar share button is pressed.
+- (IBAction)shareToolbar:(id)sender;
+
+@end