The document discusses social media and what it is. It explains that social media allows users to share content and photos, talk back to others, connect with friends, and buy products from companies. It notes that social media use has expanded to mobile devices. The document outlines some of the key things users can do on social media like sharing, making friends, and listening to music. It questions who runs social media sites and what companies should think about if their employees use social media. Overall, the document provides a basic introduction and overview of social media, its uses, and things to consider about it.