When you are not making use of the contacts functionality, but still wish to include known metadata in the results, you can prefill hidden questions with this information by adding querystring parameters to the URL.
The answers in these hidden questions can then be used in display logic, shown using variables and used in reporting.
You can prefill open text boxes, or closed questions, such as radio buttons questions, or checkbox questions. The open text box questions will result in a word cloud, the closed questions will result in bar, column or pie charts. The correct question type will depend on your specific analysis needs.