The document provides a summary of key trends in US digital media usage for 2013 based on forecasts from eMarketer. It finds that while internet and social media usage growth is slowing, mobile usage including mobile internet, video and gaming is increasing rapidly. Specifically, it reports that 137.5 million Americans will be smartphone users in 2013, up 18.8% from 2012, and that smartphone video viewing will increase nearly 22%. It also notes that while tablet adoption is growing quickly, e-reader usage is increasing more slowly.