From their website: "Pew Research Center is a nonpartisan fact tank that informs the public about the issues, attitudes and trends shaping the world. We conduct public opinion polling, demographic research, content analysis and other data-driven social science research. We do not take policy positions." Categories of fact sheets that may be helpful to librarians include Internet usage, public library usage, social trends , and information about demographic groups. Refer to their List of Topics.
More on the PEW Research Study on teens use of social media:
Value the Creative and Social-Emotional Upsides of Social Media Suggests New Survey from Common Sense Media (Connected Media Alliance, 9/24/18)
Social Media, Social Life Infographic (9/10/18)