Adding theme sets to your class allows your students to organize the excerpts or video clips they find by tagging them with recurring concepts, writing mechanics, debates, etc that you feel are appropriate. Theme sets also act as a reminder to your students of what you want them to keep an eye out for.
Ponder responses that are tagged with themes can be searched, sorted and filtered by those themes in the class activity feed.
Below are some example sets to give you some ideas.
Man v. Authority
Man v. Nature
Letter of the Law
Spirit of the Law