This document provides an overview of the social networking services Facebook and Twitter. It describes that Facebook was founded by Mark Zuckerberg at Harvard University in 2004 and now has over 1 billion active users. Twitter was created by Jack Dorsey in 2006 and allows users to send short text-based messages up to 140 characters. Both platforms revolutionized online communication by allowing users to connect with friends, follow topics of interest, and share updates.