Really interesting way of doing a multimedia search. Not sure it's classroom safe, even with safe search on there were several images that were beyond borderline. When I did compound search "algebra" + "linear" much tighter and deleted virtually all inappropriate material.
I just like the way you can explore the information. If you have students gathering information and tagging with specific tags like "wjhsconlit09" then you could pull up all of that material without interference. I think it's a great tool for that kind of exploration.