Building communities of library users -- Picking a platform and finding a voice / Lisa Bunker -- From broadcast to conversation in an academic library / Laura Little, Andrew Lopez, Jessica McCullough, Rebecca Parmer -- Find us on Facebook: the evolution of social media at a community college library / Dana A. Knott and Angel M. Gondek -- Social media and healthcare: building and sustaining communities for patients and providers / Patricia J. Devine -- Adding value with advertising: using paid promotions to build your online community / Chris Chan and Joanna Hare -- Building communities of library professionals -- Building communities of practice in the library profession / Katie Elson Anderson -- Building a personal learning network / Stony Evans -- Transforming community into action -- social media and social justice -- The urgency and agency of #OccupyNassau: actively archiving anti-racism at Princeton / Jarrett M. Drake -- Cultivating critical dialogue on Twitter / April M. Hathcock