The document discusses three social media platforms: YouTube, SlideShare, and Flickr. 1) YouTube allows individuals and organizations to communicate with a broad audience. Users can build successful YouTube channels to reach target markets. 2) SlideShare allows users to share presentations and gain exposure. Uploads can be viewed without downloading and better engage audiences. 3) Flickr is a platform for sharing photos with contacts. It helps users organize, store, and tell stories about photos online.