This document discusses how social media has impacted political engagement, youth, and privacy globally. It provides an overview of key trends in social media usage, including the rise of messaging apps and their global reach. Examples are given of how social media was used during events like the Arab Spring and 2016 US presidential election. Platforms like Twitter, Tumblr, and Reddit are examined in terms of their global audiences and political/news coverage. The document concludes that we are moving into a "third wave" of greater internet integration and engagement that will transform various sectors through changing privacy and security practices.