Social Computing and Social Media. Communication and Social Communities 11th International Conference, SCSM 2019, Held as Part of the 21st HCI International Conference, HCII 2019, Orlando, FL, USA, July 26-31, 2019, Proceedings, Part II - Meiselwitz, Gabriele; Meiselwitz, Gabriele (Springer International Publishing : Imprint: Springer, 2019)