This document provides a summary of global internet, social media, and mobile usage statistics as of Q3 2017. It finds that as of August 2017, there were over 7.5 billion people worldwide with 3.8 billion using the internet, 3 billion active on social media, and over 5 billion with mobile phones. Mobile internet penetration reached 92% and mobile accounted for over half of all web traffic. Facebook had over 2 billion active users while YouTube and WhatsApp each had over 1 billion. Global mobile data traffic grew exponentially between 2012-2017.