This document provides information about various social media platforms, including Twitter and Snapchat. For Twitter, it discusses the platform's history and purpose of allowing short message updates. It also describes how hashtags group tweets by topic and how the platform generates revenue from promoted tweets, trends, and accounts. For Snapchat, it explains the ephemeral nature of content on the platform and how it aims to encourage natural interactions. It also provides statistics on Snapchat's target demographic and growing sources of revenue like geofilters and sponsored lenses. The document discusses some legal and ethical issues that both platforms face regarding data privacy and regulation of harmful content.