This document summarizes three social media sharing sites: Instagram, which allows users to take photos or videos, add effects, and share to other social networks; YouTube, where users can upload or search for videos and share with subscribers after creating an account on the site or just searching as a guest; and Last.fm, which allows users to search for artists or songs, add to a music library, receive recommendations based on listening history, and share with other Last.fm users through other social networks.