Thinglink, the interactive and collaborative image creation tool that I've covered a lot, recently introduced a new option for commenting on images. You've always been able to let people comment on images by putting pinmarks into your images. Sometimes you might not want people writing on the image itself and that's where the new comment option comes in. Now people can write comments about your images below your images.
Applications for Education
The new Thinglink commenting option could be good for giving students feedback on the interactive images that they have created. You could also use the commenting option to have students write responses to questions that you embed into your Thinglink images.