This document discusses compelling data on social media use in the United States. Some key points include: social networks and blogs reach nearly 80% of active US internet users and represent most online time; social media is defined as platforms for publishing user-generated content; older users are increasingly using social media with the largest growth among those ages 50+; 95% of teens ages 12-17 are online and 80% use social media primarily to stay connected with family and friends; most adults describe social media experiences positively and it can increase feelings of closeness and self-esteem while triggering feel-good brain chemicals.