Its very easy to use and this example has been made using the free version. To access more features you can upgrade for US$35. You can create student accounts so you could set tasks for your students to label diagrams or images. It certainly has some potential uses in a drama class e.g labelling theatres, theatrical styles, practitioners, character profiles, annotating designs, annotating script, etc.
You can share your Thinglink by sharing a web link or embedding into a website like I have here. Certainly a tool I am looking forward to trying out this term