This document summarizes findings from Pew Research on internet and social media usage patterns. It discusses who uses social networking sites and what the most popular sites are. Key findings include that Facebook is the most popular social networking site, with 71% of online adults using it, while other sites like Twitter, Instagram, and Pinterest attract different demographics. Women are much more likely than men to use Pinterest, and younger adults dominate Twitter and Instagram usage, according to Pew Research data on trends.