This document summarizes several major media platforms: Facebook is a social networking site with over 1.3 billion users that allows users to share photos, messages and activities. Google is a multinational corporation specializing in internet services like search engines and online advertising. Twitter is a microblogging site where users share 140-character messages called tweets, with over 100 million users posting 340 million tweets per day. YouTube is a video sharing website where users can upload, view and share videos, and is owned by Google.