Social Share is a free plug-in in PowerPoint developed through the Microsoft Garage that allows you to share slides and decks to Facebook and Twitter without leaving PowerPoint as an image, album or as a video.

Features:

• Post your slide as an image, album or even as video: You can choose any format you want to share your content.Your friends can see your post on Facebook, and comment on it and provide you feedback!

• See your social updates in PowerPoint itself: When your friends comment on your post, you can see it in PowerPoint.

• Share a link to your file: Social Share automatically uploads your document to OneDrive so you can share a link with your friends.

Source: http://microsoft-news.com/microsoft-social-share-makes-it-easier-to-share-your-powerpoint-presentations-to-social-networks/