If you're not on SlideShare, you should reconsider! It's a simple way to add variety to your content, with a huge and highly engaged community.
To add a slideshare account to your Hub, head to the Hub's management screen and click on 'Manage Content' found in the left hand menu. From there click on the '+ New Stream' button at the bottom of the screen and you'll be able to import a variety of content into your Hub!
Enter the username of the SlideShare you want to import.
Click import and voila! You have just added content from Slideshare. Pretty nifty, huh?