Lessons are best limited to topics that lend themselves to annotatable images.
ThingLink has a lot of potential, but like any ed tech tool, successful integration is dependent upon matching the tool to content and learning goals, as well as being cognizant of the tool's strengths and weaknesses. Recommended with caution.
How I Use It
I would use this product as a tool to integrate visual and information literacy into learning. The pedagogical potential for multiliteracy learning is great here, but students must be taught the concept of annotation first, otherwise you'll end of with images that have been haphazardly targeted. When used appropriately, ThingLink enhances understanding of how to analyze images (visual literacy). Research skills can also be developed using this tool. However, be aware that the product's ease of use can make for lazy researching, aka copying and pasting URLs and text. A better approach is to integrate library sources (print and electronic) into the research process when using ThingLink because it forces students to make more effort to read, comprehend, summarize and synthesize.