You could create a clickable image and keep it private on Thinglink--that means that only people who have the link can see it. You could have your students log in, check out the image (watch videos, visit websites you link to the image, etc.) and then leave comments below the image. What a great way to get them interested in a subject and breathe life into a stuffy textbook.
Look at this image. BEFORE you click on the links, think about what you see. What is going on here? What are these people doing? How do they feel?