The document discusses how social networks and media have changed in the digital age. It notes that information is now abundant, cheap, and personally oriented rather than institutionally oriented. People's media ecologies have expanded to include many new devices and platforms. This has led to changes in how people access and share information, including more content creation and social networking. The document provides tips on how libraries can act as nodes in social networks by helping people find, assess, and act on information in this new media landscape.