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/GooglePlusSampleAppDelegate.h

@@ -0,0 +1,41 @@
+//
+//  GooglePlusSampleAppDelegate.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 <UIKit/UIKit.h>
+
+@class GooglePlusShare;
+@class GooglePlusSignInButton;
+@class GTMOAuth2Authentication;
+
+@interface GooglePlusSampleAppDelegate : UIResponder<UIApplicationDelegate>
+
+// The sample app's |UIWindow|.
+@property (retain, nonatomic) UIWindow *window;
+// The navigation controller.
+@property (retain, nonatomic) UINavigationController *navigationController;
+// The Google+ sign-in button to handle the URL redirect.
+@property (retain, nonatomic) GooglePlusSignInButton *signInButton;
+// The OAuth 2.0 authentication used in the application.
+@property (retain, nonatomic) GTMOAuth2Authentication *auth;
+// The Google+ share object to handle the URL redirect.
+@property (retain, nonatomic) GooglePlusShare *share;
+
+// The OAuth 2.0 client ID to be used for Google+ sign-in, share, and moments.
++ (NSString *)clientID;
+
+@end