For a student of rhetoric, primary sources are texts of any kind, not just verbal, but visual, and physical--any medium, in short, in which the structure that manifests ideas or information carries a message of its own. Thus the resources listed below will lead you to many types of texts, from printed and video news reports to works of art to social media.
Of course you're familiar with social media, but you may not have thought of it as a resource for finding primary resource material.