There are tons of platforms that you can embed into your bulb pages including: iWorks, Prezi, Twitter, Instagram, Explain Everything, ThingLink, Tumblr, News Sources, etc.
How to add a URL from another source
1. Press ENTER/RETURN on your keyboard on a bulb page to get our media toolbar. Click on URL.
2. Copy and paste the URL from the website you want to embed.
3. Click SUBMIT. The URL will embed directly into your bulb page!
Watch a video on adding external links' URL's to your bulb page: