Modeling and Mining Ubiquitous Social Media International Workshops MSM 2011, Boston, MA, USA, October 9, 2011, and MUSE 2011, Athens, Greece, September 5, 2011, Revised Selected Papers - Atzmueller, Martin; Chin, Alvin; Helic, Denis; Hotho, Andreas (Springer Berlin Heidelberg : Imprint: Springer, 2012)