Have you ever wondered how Twitter works? Or what QR codes are? Common Craft videos can help show you how these and many other items function. The videos are short and easy to understand. And they help to explain many of the web's newest functions.
I've used Common Craft videos to show students about searching the web. You'll have to call them up and show them from the website unless you want to join their site. I haven't done that yet, but I can still use the videos, just not embed or save them.
Here's the link to their video on blogging. Check out the site any time you need an explanation of a new topic or you want a quick explanation for your students.