This document lists various social media platforms and popular topics related to each one in a series of short paragraphs. Key social media platforms mentioned include LinkedIn, YouTube, Google+, Facebook, Tumblr, Email, Foursquare, Twitter, the iPhone, and Klout. Popular viral videos, celebrities, apps, and trends from each platform are also listed. The document provides a high-level overview of different forms of social media and some of their most discussed elements.